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Sunday, October 20, 2019

Tort

From Wikipedia, the free encyclopedia

A tort, in common law jurisdictions, is a civil wrong that causes a claimant to suffer loss or harm, resulting in legal liability for the person who commits the tortious act. It can include the intentional infliction of emotional distress, negligence, financial losses, injuries, invasion of privacy and many other things.

Tort law, where the purpose of a legal action is to obtain a private civil remedy such as damages, may be compared to criminal law, which deals with criminal wrongs that are punishable by the state. Tort law may also be contrasted with contract law, which also provides a civil remedy after breach of duty; but whereas the contractual obligation is one chosen by the parties, the obligation in both tort and crime is imposed by the state. In both contract and tort, successful claimants must show that they have suffered foreseeable loss or harm as a direct result of the breach of duty.

Terminology

The person who commits the act is called a tortfeasor. Although crimes may be torts, the cause of legal action in civil torts is not necessarily the result of criminal action; the harm in civil torts may be due to negligence, which does not amount to criminal negligence. The victim of the harm can recover their loss as damages in a lawsuit. In order to prevail, the plaintiff in the lawsuit, commonly referred to as the injured party, must show that the actions or lack of action was the legally recognizable cause of the harm. The equivalent of tort in civil law jurisdictions is "delict". 

Legal injuries are not limited to physical injuries and may include emotional, economic, or reputational injuries as well as violations of privacy, property, or constitutional rights. Torts comprise such varied topics as automobile accidents, false imprisonment, defamation, product liability, copyright infringement, and environmental pollution (toxic torts). 

Compared to criminal cases, tort lawsuits have a lower burden of proof, namely "preponderance of evidence", rather than beyond a reasonable doubt. Sometimes a claimant may prevail in a tort case even if the defendant who allegedly caused harm were acquitted in an earlier criminal trial. For example, O. J. Simpson was acquitted in criminal court of murder but later found liable for the tort of wrongful death

Both tort law and criminal law may impose liability where there is:

History

Roman law contained provisions for torts in the form of delict, which later influenced the civil law jurisdictions in Continental Europe, but a distinctive body of law arose in the common law world traced to English tort law. The word 'tort' was first used in a legal context in the 1580s, although different words were used for similar concepts prior to this time.

Medieval period

Torts and crimes at common law originate in the Germanic system of compensatory fines for wrongs (OE unriht), with no clear distinction between crimes and other wrongs. In Anglo-Saxon law, most wrongs required payment in money or in kind (bōt, literally 'remedy') to the wronged person or their clan. Wīte (literally 'blame, fault') was paid to the king or holder of a court for disturbances of public order. Weregild, which was a murder fine based on a victim's worth, was intended to prevent blood feuds. Some wrongs in later law codes were botleas 'without remedy' (e.g. theft, open murder, arson, treason against one's lord), that is, unable to be compensated, and those convicted of a botleas crime were at the king's mercy. Items or creatures which caused death were also destroyed as deodands. Assessing intention was a matter for the court, but Alfred the Great's Doom Book did distinguish unintentional injuries from intentional ones, whereas culpability depended on status, age, and gender. 

After the Norman Conquest, fines were paid only to courts or the king, and quickly became a revenue source. A wrong became known as a tort or trespass, and there arose a division between civil pleas and pleas of the crown. The petty assizes (i.e. of novel disseisin, of mort d'ancestor, and of darrein presentment) were established in 1166 as a remedy for interference with possession of freehold land. The trespass action was an early civil plea in which damages were paid to the victim; if no payment was made, the defendant was imprisoned. The plea arose in local courts for slander, breach of contract, or interference with land, goods, or persons. Although the details of its exact origin are unclear, it became popular in royal courts so that in the 1250s the writ of trespass was created and made de cursu (available by right, not fee); however, it was restricted to interference with land and forcible breaches of the king's peace. It may have arisen either out of the "appeal of felony", or assize of novel disseisin, or replevin. Later, after the Statute of Westminster 1285, in the 1360s, the "trespass on the case" action arose for when the defendant did not direct force. As its scope increased, it became simply "action on the case". The English Judicature Act passed 1873 through 1875 abolished the separate actions of trespass and trespass on the case.

In 1401, the English case Beaulieu v Finglam imposed strict liability for the escape of fire; additionally, strict liability was imposed for the release of cattle. Negligently handling fire was of particular importance in these societies given capacity for destruction and relatively limited firefighting resources. Liability for common carrier, which arose around 1400, was also emphasized in the medieval period. Unintentional injuries were relatively infrequent in the medieval period. As transportation improved and carriages became popular in the 18th and 19th centuries, however, collisions and carelessness became more prominent in court records. In general, scholars of England such as William Blackstone took a hostile view to litigation, and rules against champerty and maintenance and vexatious litigation existed. The restriction on assignment of a cause of action is a related rule based on public policy.

English influence

The right of victims to receive redress was regarded by later English scholars as one of the rights of Englishmen. Blackstone's Commentaries on the Laws of England, which was published in the late 18th century, contained a volume on "private wrongs" as torts and even used the word tort in a few places.

United States influence

United States tort law was influenced by English law and Blackstone's Commentaries on the Laws of England, with several state constitutions specifically providing for redress for torts in addition to reception statutes which adopted English law. However, tort law was viewed as relatively undeveloped by the mid-19th century; the first American treatise on torts was published in the 1860s but the subject became particularly established when Oliver Wendell Holmes, Jr wrote on the subject in the 1880s. Holmes' writings have been described as the "first serious attempt in the common law world to give torts both a coherent structure and a distinctive substantive domain", although Holmes' summary of the history of torts has been critically reviewed. The 1928 US case of Palsgraf v. Long Island Railroad Co. heavily influenced the British judges in the 1932 House of Lords case of Donoghue v Stevenson.

Modern development

The law of torts for various jurisdictions has developed independently. In the case of the United States, a survey of trial lawyers pointed to several modern developments, including strict liability for products based on Greenman v. Yuba Power Products, the limitation of various immunities (e.g. sovereign immunity, charitable immunity), comparative negligence, broader rules for admitting evidence, increased damages for emotional distress, and toxic torts and class action lawsuits. However, there has also been a reaction in terms of tort reform, which in some cases have been struck down as violating state constitutions, and federal preemption of state laws.

Modern torts are heavily affected by insurance and insurance law, as most cases are settled through claims adjustment rather than by trial, and are defended by insurance lawyers, with the insurance policy, a deep pocket limit, setting a ceiling on the possible payment.

Comparative law

In the international comparison of modern tort law, common law jurisdictions based upon English tort law have foundational differences from civil law jurisdiction, which may be based on the Roman concept of delict. Even among common law countries, however, significant differences exist. For example, in England legal fees of the winner are paid by the loser (the English rule versus the American rule of attorney fees). Common law systems include United States tort law, Australian tort law, Canadian tort law, Irish tort law, and Scots Law of Delict. The Jewish law of rabbinic damages is another example although tort in Israeli law is technically similar to English law as it was enacted by British Mandate of Palestine authorities in 1944 and took effect in 1947. There is more apparent split between the Commonwealth countries (principally England, Canada and Australia) and the United States.

The United States has been perceived as particularly prone to filing tort lawsuits even relative to other common law countries, although this perception has been criticized and debated. As of 1987, class actions were relatively uncommon outside of the United States. As of 1987, English law was less generous to the plaintiff in the following ways: contingent fee arrangements were restricted, English judges tried more decisions and set damages rather than juries, wrongful death lawsuits were relatively restricted, punitive damages were relatively unavailable, the collateral source rule was restricted, and strict liability, such as for product liability, was relatively unavailable. England's welfare state, such as free healthcare through National Health Service, may limit lawsuits. On the other hand, as of 1987 England had no workers compensation system and lawsuits due to workplace injuries were relatively common and facilitated by trade unions, whereas in the United States the system of workers' compensation insurance prohibits lawsuits against the employer although lawsuits against third parties such as manufacturers does occur. The United States also has faced a rise in no-fault insurance for automobile liability in several states. In England, ombudsmen may also take cases which could alternatively become tort lawsuits.

When comparing Australia and the United States, Australia's tort law is similarly state law; however, there is a federal common law for torts unlike the United States. The influence of the United States on Australia has been limited. The United States may have influenced Australia's development of strict liability for products indirectly through legislation affected by European Union, and in the 1990s class actions were introduced in Australia. Australia has universal healthcare and 'welfare state' systems which also limit lawsuits. In New Zealand, a no-fault accident compensation system has limited the development of personal injury torts.

Conflict of laws

In certain instances, different jurisdictions' law may apply to a tort, in which case rules have developed for which law to apply. This occurs particularly in the United States, where each of the 50 states may have different state laws, but also may occur in other countries with a federal system of states, or internationally.

Categories

Torts may be categorized in several ways, with a particularly common division between negligent and intentional torts. Quasi-torts may be used to refer to torts which are similar to but somewhat different from typical torts. Particularly in the United States, "collateral tort" is used to refer to torts in labour law such as intentional infliction of emotional distress ("outrage"); or wrongful dismissal; these evolving causes of action are debated and overlap with contract law or other legal areas to some degree.

The most common action in tort is negligence. The tort of negligence provides a cause of action leading to damages, or to relief, in each case designed to protect legal rights, including those of personal safety, property, and, in some cases, intangible economic interests or noneconomic interests such as the tort of negligent infliction of emotional distress in the United States. Negligence actions include claims coming primarily from car accidents and personal injury accidents of many kinds, including clinical negligence, worker's negligence and so forth. Product liability cases, such as those involving warranties, may also be considered negligence actions or, particularly in the United States, may apply regardless of negligence or intention through strict liability.

Intentional torts include, among others, certain torts arising from the occupation or use of land. The tort of nuisance, for example, involves strict liability for a neighbor who interferes with another's enjoyment of his real property. Trespass allows owners to sue for entrances by a person (or his structure, such as an overhanging building) on their land. Several intentional torts do not involve land. Examples include false imprisonment, the tort of unlawfully arresting or detaining someone, and defamation (in some jurisdictions split into libel and slander), where false information is broadcast and damages the plaintiff's reputation. Other intentional torts include Battery, Assault, Trespass to Chattels, Intentional Infliction of Emotional Distress, Misrepresentation, and Alienation of Affections. 

In some cases, the development of tort law has spurred lawmakers to create alternative solutions to disputes. For example, in some areas, workers' compensation laws arose as a legislative response to court rulings restricting the extent to which employees could sue their employers in respect of injuries sustained during employment. In other cases, legal commentary has led to the development of new causes of action outside the traditional common law torts. These are loosely grouped into quasi-torts or liability torts.

Negligence

Negligence is a tort which arises from the breach of the duty of care owed by one person to another from the perspective of a reasonable person. Although credited as appearing in the United States in Brown v. Kendall, the later Scottish case of Donoghue v Stevenson [1932] AC 562, followed in England, brought England into line with the United States and established the 'tort of negligence' as opposed to negligence as a component in specific actions. In Donoghue, Mrs. Donoghue drank from an opaque bottle containing a decomposed snail and claimed that it had made her ill. She could not sue Mr. Stevenson for damages for breach of contract and instead sued for negligence. The majority determined that the definition of negligence can be divided into four component parts that the plaintiff must prove to establish negligence. The elements in determining the liability for negligence are:
  • The plaintiff was owed a duty of care through a special relationship (e.g. doctor-patient) or some other principle
  • There was a dereliction or breach of that duty
  • The tortfeasor directly caused the injury [but for the defendant's actions, the plaintiff would not have suffered an injury].
  • The plaintiff suffered damage as a result of that breach
  • The damage was not too remote; there was proximate cause to show the breach caused the damage
In certain cases, negligence can be assumed under the doctrine of res ipsa loquitur (Latin for "the thing itself speaks"); particularly in the United States, a related concept is negligence per se.

For example, in the business realm, the auditor has a duty of care to the company they are auditing - that the documents created are a true and reliable representation of the company's financial position. However, as per Esanda Finance Corporation Ltd v. Peat Marwick Hungerfords, such auditors do NOT provide a duty of care to third parties who rely on their reports. An exception is where the auditor provides the third party with a privity letter, explicitly stating the third party can rely on the report for a specific purpose. In such cases, the privity letter establishes a duty of care.

The case Chapman v Hearse added to the precedent of negligence where in previous cases reasonable foreseeability was applied narrowly to include all predictable actions, Chapman v Hearse extended this to include all damages of the same nature which could be reasonably foreseen.

Proximate cause

Proximate cause means that you must be able to show that the harm was caused by the tort you are suing for. The defense may argue that there was a prior cause or a superseding intervening cause. A common situation where a prior cause becomes an issue is the personal injury car accident, where the person re-injures an old injury. For example, someone who has a bad back is injured in the back in a car accident. Years later he is still in pain. He must prove the pain is caused by the car accident, and not the natural progression of the previous problem with the back. A superseding intervening cause happens shortly after the injury. For example, if after the accident the doctor who works on you commits malpractice and injures you further, the defense can argue that it was not the accident, but the incompetent doctor who caused your injury. 

Intentional torts

Intentional torts are any intentional acts that are reasonably foreseeable to cause harm to an individual, and that do so. Intentional torts have several subcategories:
An intentional tort requires an overt act, some form of intent, and causation. In most cases, transferred intent, which occurs when the defendant intends to injure an individual but actually ends up injuring another individual, will satisfy the intent requirement. Causation can be satisfied as long as the defendant was a substantial factor in causing the harm.

Statutory torts

A statutory tort is like any other, in that it imposes duties on private or public parties, however they are created by the legislature, not the courts. For example, the European Union's Product Liability Directive imposes strict liability for defective products that harm people; such strict liability is not uncommon although not necessarily statutory.

As another example, in England common law liability of a landowner to guests or trespassers was replaced by the Occupiers' Liability Act 1957; a similar situation occurred in the U.S. State of California in which a judicial common law rule established in Rowland v. Christian was amended through a 1985 statute. Statutory torts also spread across workplace health and safety laws and health and safety in food. In some cases federal or state statutes may preempt tort actions, which is particularly discussed in terms of the U.S. FDA Preemption; although actions in the United States for medical devices are preempted due to Riegel v. Medtronic, Inc. (2008), actions for medical drugs are not due to Wyeth v. Levine (2009).

Nuisance

"Nuisance" is traditionally used to describe an activity which is harmful or annoying to others such as indecent conduct or a rubbish heap. Nuisances either affect private individuals (private nuisance) or the general public (public nuisance). The claimant can sue for most acts that interfere with their use and enjoyment of their land. In English law, whether activity was an illegal nuisance depended upon the area and whether the activity was "for the benefit of the commonwealth", with richer areas subject to a greater expectation of cleanliness and quiet. The case Jones v Powell (1629) provides an early example, in which a person's professional papers were damaged by the vapors of a neighboring brewery. Although the outcome of this case is unclear, Whitelocke of the Court of the King's Bench is recorded as saying that since the water supply in area was already contaminated, the nuisance was not actionable as it is "better that they should be spoiled than that the commonwealth stand in need of good liquor".

In English law, a related category of tort liability was created in the case of Rylands v Fletcher (1868): strict liability was established for a dangerous escape of some hazard, including water, fire, or animals as long as the cause was not remote. In Cambridge Water Co Ltd v Eastern Counties Leather plc (1994), chemicals from a factory seeped through a floor into the water table, contaminating East Anglia's water reservoirs. The Rylands rule remains in use in England and Wales. In Australian law, it has been merged into negligence.

Defamation

Defamation is tarnishing the reputation of someone; it has two varieties, slander and libel. Slander is spoken defamation and libel is printed or broadcast defamation. The two otherwise share the same features: making a factual assertion for which evidence does not exist. Defamation does not affect or hinder the voicing of opinions, but does occupy the same fields as rights to free speech in the First Amendment to the Constitution of the United States, or Article 10 of the European Convention of Human Rights. Related to defamation in the U.S. are the actions for misappropriation of publicity, invasion of privacy, and disclosure. Abuse of process and malicious prosecution are often classified as dignitary torts as well.

Business torts

Business torts (i.e., economic torts) typically involve commercial transactions, and include tortious interference with trade or contract, fraud, injurious falsehood, and negligent misrepresentation. Negligent misrepresentation torts are distinct from contractual cases involving misrepresentation in that there is no privity of contract; these torts are likely to involve pure economic loss which has been less-commonly recoverable in tort. One criterion for determining whether economic loss is recoverable is the "foreseeability" doctrine. The economic loss rule is highly confusing and inconsistently applied and began in 1965 from a California case involving strict liability for product defects; in 1986, the U.S. Supreme Court adopted the doctrine in East River S.S. Corp. v. Transamerica Deleval, Inc. In 2010, the supreme court of the U.S. state of Washington replaced the economic loss doctrine with an "independent duty doctrine".

Economic antitrust torts have been somewhat submerged by modern competition law. However, in the United States, private parties are permitted in certain circumstances to sue for anticompetitive practices, including under federal or state statutes or on the basis of common law tortious interference, which may be based upon the Restatement (Second) of Torts §766. Federal laws include the Sherman Antitrust Act of 1890 followed by the Clayton Antitrust Act which restrict cartels and through Federal Trade Commission regulate mergers and acquisitions. In the European Union, articles 101 and 102 of the Treaty on the Functioning of the European Union apply but allowing private actions to enforce antitrust laws is under discussion.

Negligent misrepresentation as tort where no contractual privity exists was disallowed in England by Derry v Peek [1889]; however, this position was overturned in Hedley Byrne v Heller in 1964 so that such actions were allowed if a "special relationship" existed between the plaintiff and defendant. United States courts and scholars "paid lip-service" to Derry; however, scholars such as William Prosser argued that it was misinterpreted by English courts. The case of Ultramares Corporation v. Touche (1932) limited the liability of an auditor to known identified beneficiaries of the audit and this rule was widely applied in the United States until the 1960s. The Restatement (Second) of Torts expanded liability to "foreseeable" users rather than specifically identified "foreseen" users of the information, dramatically expanding liability and affecting professionals such as accountants, architects, attorneys, and surveyors. As of 1989, most U.S. jurisdictions follow either the Ultramares approach or the Restatement approach.

The tort of deceit for inducement into a contract is a tort in English law, but in practice has been replaced by actions under Misrepresentation Act 1967. In the United States, similar torts existed but have become superseded to some degree by contract law and the pure economic loss rule. Historically (and to some degree today), fraudulent (but not negligent) misrepresentation involving damages for economic loss may be awarded under the "benefit-of-the-bargain" rule (damages identical to expectation damages in contracts) which awards the plaintiff the difference between the value represented and the actual value. Beginning with Stiles v. White (1846) in Massachusetts, this rule spread across the country as a majority rule with the "out-of-pocket damages" rule as a minority rule. Although the damages under the "benefit-of-the-bargain" are described as compensatory, the plaintiff is left better off than before the transaction. Since the economic loss rule would eliminate these benefits if applied strictly, there is an exception to allow the misrepresentation tort if not related to a contract.

Liability, defenses, and remedies

Indirect liability may arise due to some involvement, notably through joint and several liability doctrines as well as forms of secondary liability. Liability may arise through enterprise liability. Other concepts include market share liability.

Vicarious liability

In certain cases, a person might be liable for their employee or child under the law of agency through the doctrine of respondeat superior. For example, if a shop employee spilled cleaning liquid on the supermarket floor and a victim fell and suffered injuries, the plaintiff might be able to sue either the employee or the employer. There is considerable academic debate about whether vicarious liability is justified on no better basis than the search for a solvent defendant, or whether it is well founded on the theory of efficient risk allocation.

Defenses

A successful defense absolves the defendant from full or partial liability for damages. Apart from proof that there was no breach of duty, there are three principal defenses to tortious liability.

Consent and warning

Typically, a victim cannot hold another liable if the victim has implicitly or explicitly consented to engage in a risky activity. This is frequently summarized by the maxim "volenti non fit injuria" (Latin: "to a willing person, no injury is done" or "no injury is done to a person who consents"). In many cases, those engaging in risky activities will be asked to sign a waiver releasing another party from liability. 

For example, spectators to certain sports are assumed to accept a risk of injury, such as a hockey puck or baseball striking a member of the audience. Warnings by the defendant may also provide a defense depending upon the jurisdiction and circumstances. This issue arises, for example, in the duty of care that landowners have for guests or trespasses, known as occupiers' liability.

Comparative or contributory negligence

If the victim has contributed to causing their own harm through negligent or irresponsible actions, the damages may be reduced or eliminated entirely. The English case Butterfield v. Forrester (1809) established this defense. In England, this "contributory negligence" became a partial defense, but in the United States, any fault by the victim completely eliminated any damages. This meant that if the plaintiff was 1% at fault, the victim would lose the entire lawsuit. This was viewed as unnecessarily harsh and therefore amended to a comparative negligence system in many states; as of 2007 contributory negligence exists in only a few states such as North Carolina and Maryland.

In comparative negligence, the victim's damages are reduced according to the degree of fault. Comparative negligence has been criticized as allowing a plaintiff who is recklessly 95% negligent to recover 5% of the damages from the defendant. Economists have further criticized comparative negligence as not encouraging precaution under the calculus of negligence. In response, many states now have a 50% rule where the plaintiff recovers nothing if the plaintiff is more than 50% responsible.

Illegality

If the claimant is involved in wrongdoing at the time the alleged negligence occurred, this may extinguish or reduce the defendant's liability. The legal maxim ex turpi causa non oritur actio, Latin for "no right of action arises from a despicable cause". Thus, if a burglar is verbally challenged by the property owner and sustains injury when jumping from a second story window to escape apprehension, there is no cause of action against the property owner even though that injury would not have been sustained but for the property owner's intervention.

Other defenses and immunities

Historically, immunity has been granted to governments under sovereign immunity and to charitable organizations under charitable immunity, although these have eroded in the United States.

Various laws limit liability when giving aid to a person in need; liability can arise from a failure to help due to the duty to rescue.

Remedies

The main remedy against tortious loss is compensation in damages or money. In a limited range of cases, tort law will tolerate self-help, such as reasonable force to expel a trespasser. This is a defense against the tort of battery. Further, in the case of a continuing tort, or even where harm is merely threatened, the courts will sometimes grant an injunction, such as in the English case Miller v Jackson (1977). This means a command, for something other than money by the court, such as restraining the continuance or threat of harm. Usually injunctions will not impose positive obligations on tortfeasors, but some Australian jurisdictions can make an order for specific performance to ensure that the defendant carries out their legal obligations, especially in relation to nuisance matters.

Theory and reform

Scholars and lawyers have identified conflicting aims for the law of tort, to some extent reflected in the different types of damages awarded by the courts: compensatory, aggravated, and punitive. British scholar Glanville Williams notes four possible bases on which different torts rested: appeasement, justice, deterrence and compensation.

From the late 1950s a group of legally oriented economists and economically oriented lawyers known as law and economics scholars emphasized incentives and deterrence, and identified the aim of tort as being the efficient distribution of risk. Ronald Coase, a principal proponent, argued in The Problem of Social Cost (1960) that the aim of tort law, when transaction costs are high, should be to reflect as closely as possible the allocation of risk and liability at which private parties arrive when transaction costs are low.

Since the mid-to-late 20th century, calls for reform of tort law have come from various perspectives. Some calls for reform stress the difficulties encountered by potential claimants. For example, because not all people who have accidents can find solvent defendants from which to recover damages in the courts, P. S. Atiyah has called the situation a "damages lottery". Consequently, in New Zealand, the government in the 1960s established a no-fault system of state compensation for accidents. Similar proposals have been the subject of command papers in the UK and much academic debate.

In the U.S., reform has typically limited the scope of tort law and damages available, such as limiting joint and several liability, the collateral source rule, or capping noneconomic damages for emotional distress or punitive damages. These reform statutes are sometimes rejected as unconstitutional under the state constitutions by state supreme courts, with the Seventh Amendment to the United States Constitution possibly also relevant. Theoretical and policy considerations are central to fixing liability for pure economic loss and of public bodies.

Relationship to contract law

Tort is sometimes viewed as the causes of action which are not defined in other areas such as contract or fiduciary law. However, tort and contract law are similar in that both involve a breach of duties, and in modern law these duties have blurred and it may not be clear whether an action "sounds in tort or contract"; if both apply and different standards apply for each (such as a statute of limitations), courts will determine which is the "gravamen" (the most applicable). Circumstances such as those involving professional negligence may involve both torts and contracts. The choice may affect time limits or damages, particularly given that damages are typically relatively limited in contract cases while in tort cases noneconomic damages such as pain and suffering may be awarded. Punitive damages are relatively uncommon in contractual cases versus tort cases. However, compensation for defective but not unsafe products is typically available only through contractual actions through the law of warranty.

In the United Kingdom, plaintiffs in professional negligence cases have some degree of choice in which law while in commercial transactions contract law applies; in unusual cases, intangible losses have been awarded in contract law cases.

The English case Hadley v. Baxendale (1854), which was adopted in the United States, split contract and tort damages by foreseeability of the damages when the contract was made. In the United States, the pure economic loss rule was adopted to further prevent negligence lawsuits in breach of contract cases. This "economic loss rule" was adopted by the Supreme Court of the United States East River Steamship Corp V Transamerica Delaval Inc. (1986) and expanded across the country in a non-uniform manner, leading to confusion. Among other examples, the tort of insurance bad faith arises out of a contractual relationship, and "collateral torts" such as wrongful dismissal involving possible overlap with labour law contracts.

Overlap with criminal law

There is some overlap between criminal law and tort. For example, in English law an assault is both a crime and a tort (a form of trespass to the person). A tort allows a person, usually the victim, to obtain a remedy that serves their own purposes (for example by the payment of damages to a person injured in a car accident, or the obtaining of injunctive relief to stop a person interfering with their business). Criminal actions on the other hand are pursued not to obtain remedies to assist a person – although often criminal courts do have power to grant such remedies – but to remove their liberty on the state's behalf. This explains why incarceration is usually available as a penalty for serious crimes, but not usually for torts. In early common law, the distinction between crime and tort was not distinct.

The more severe penalties available in criminal law also means that it requires a higher burden of proof to be discharged than the related tort. For example, in the O. J. Simpson murder trial, the jury was not convinced beyond reasonable doubt that O. J. Simpson had committed the crime of murder; but in a later civil trial, the jury in that case decided that there was sufficient evidence to meet the standard of preponderance of the evidence required to prove the tort of wrongful death.

Many jurisdictions, especially the US, retain punitive elements in tort damages, for example in anti-trust and consumer-related torts, making tort blur the line with criminal acts. Also there are situations where, particularly if the defendant ignores the orders of the court, a plaintiff can obtain a punitive remedy against the defendant, including imprisonment. Some torts may have a public element – for example, public nuisance – and sometimes actions in tort will be brought by a public body. Also, while criminal law is primarily punitive, many jurisdictions have developed forms of monetary compensation or restitution which criminal courts can directly order the defendant to pay to the victim.

Law and economics

William M. Landes, Richard A. Posner, and Steven Shavell have initiated a line of research in the law and economics literature that is focused on identifying the effects of tort law on people's behavior. These studies often make use of concepts that were developed in the field of game theory.

Driving under the influence

From Wikipedia, the free encyclopedia
 
A "Don't Drink and Drive" sign is placed in front of a wrecked car to discourage impaired driving.
 
Driving under the influence (DUI) is the crime or offense of driving or operating a motor vehicle while impaired by alcohol or other drugs (including recreational drugs and those prescribed by physicians), to a level that renders the driver incapable of operating a motor vehicle safely.

Terminology

Also called driving while impaired/driving while intoxicated (DWI), drunk driving, operating while intoxicated (OWI), operating [a] vehicle under the influence of alcohol or drugs (OVI) in Ohio, drink-driving (UK), or impaired driving (Canada). 

The name of the offense varies from jurisdiction to jurisdiction and from legal to colloquial terminology. In the United States, the specific criminal offense is usually called driving under the influence, but in some states "driving while intoxicated" (DWI), "operating while impaired" (OWI) or "operating while ability impaired", "operating a vehicle under the influence" (OVI), etc. Such laws may also apply to boating or piloting aircraft. Vehicles can include farm machinery and horse-drawn carriages. Other commonly used terms to describe these offenses include drinking and driving, drunk driving, drunken driving, impaired driving, operating under the influence, or "over the prescribed limit". 

In the United Kingdom, the offense is often known as "drunk in charge of a motor vehicle" or "drunk in charge" due to the wording of the Licensing Act 1872. In relation to motor vehicles, the Road Traffic Act 1988 creates a narrower offense of driving (or being in charge of) a vehicle while having breath, blood or urine alcohol levels above the prescribed limits (colloquially called "being over the limit"); and a broader offense of "driving while unfit through drink or drugs," which can apply even with levels below the limits. A separate offense in the 1988 Act applies to bicycles. While the 1872 Act is mostly superseded, the offense of being "drunk while in charge ... of any carriage, horse, cattle, or steam engine" is still in force; "carriage" has sometimes been interpreted as including mobility scooters.

Definition

The criminal offense may not involve actual driving of the vehicle but rather may broadly include being physically in control of a car while intoxicated even if the person charged is not driving. For example, a person found in the driver's seat of a car while intoxicated and holding the keys, even while parked, may be charged with DUI, because he or she is in control of the vehicle. In construing the terms DUI, DWI, OWI, and OVI, some states therefore make it illegal to drive a motor vehicle while under the influence or driving while intoxicated while others indicate that it is illegal to operate a motor vehicle. There is a split of authority across the country regarding this issue. Some states permit enforcement of DUI/DWI and OWI/OVI statutes based on "operation and control" of a vehicle, while others require actual "driving". "The distinction between these two terms is material, for it is generally held that the word 'drive,' as used in statutes of this kind, usually denotes movement of the vehicle in some direction, whereas the word 'operate' has a broader meaning so as to include not only the motion of the vehicle but also acts which engage the machinery of the vehicle that, alone or in sequence, will set in motion the motive power of the vehicle." (State v. Graves (1977) 269 S.C. 356 [237 S.E.2d 584, 586-588, 586. fn. 8]. 

Merriam Webster's Dictionary defines DUI as the "crime of driving a vehicle while drunk; also : a person who is arrested for driving a vehicle while drunk; the act or crime of driving while affected by alcohol or other drugs; a person who is arrested for or convicted of driving under the influence or an arrest or conviction for driving under the influence. In some countries (including Australia and many jurisdictions throughout the United States), a person can be charged with a criminal offense for riding a bike, skateboard, or horse while intoxicated or under the influence of alcohol.

Alcohol

With alcohol consumption, a drunk driver's level of intoxication is typically determined by a measurement of blood alcohol content or BAC; but this can also be expressed as a breath test measurement, often referred to as a BrAC. A BAC or BrAC measurement in excess of the specific threshold level, such as 0.08%, defines the criminal offense with no need to prove impairment. In some jurisdictions, there is an aggravated category of the offense at a higher BAC level, such as 0.12%, 0.15% or 0.25%. In many jurisdictions, police officers can conduct field tests of suspects to look for signs of intoxication. The US state of Colorado has a maximum blood content of THC for drivers who have consumed cannabis, but it has been difficult to enforce.

In some countries, it is measured and known in gram per blood liter, with 0.5 g/L similar to a 0.05% rate, other use per mille (per thousand sign) with 0.5‰ = 0.05%.

Blood alcohol content

A law enforcement grade Breathalyzer, specifically an Alco-Sensor IV
 
Drinking enough alcohol to cause a blood alcohol concentration (BAC) of 0.03–0.12% typically causes a flushed, red appearance in the face and impaired judgment and fine muscle coordination. A BAC of 0.09% to 0.25% causes lethargy, sedation, balance problems and blurred vision. A BAC from 0.18% to 0.30% causes profound confusion, impaired speech (e.g., slurred speech), staggering, dizziness and vomiting. A BAC from 0.25% to 0.40% causes stupor, unconsciousness, anterograde amnesia, vomiting and respiratory depression (potentially life-threatening). A BAC from 0.35% to 0.80% causes a coma (unconsciousness), life-threatening respiratory depression and possibly fatal alcohol poisoning. There are a number of factors that affect when your BAC will reach or exceed 0.08, including how much you weigh the time frame that you been drinking and if you ate within the time of drinking. A 170 lbs male can drink more than a 135 lbs female, before being over the BAC level. 

A breathalyzer is a device for estimating BAC from a breath sample. It was developed by inventor Robert Frank Borkenstein and registered as a trademark in 1954, but many people use the term to refer to any generic device for estimating blood alcohol content. With the advent of a scientific test for BAC, law enforcement regimes moved from sobriety tests (e.g., asking the suspect to stand on one leg) to having more than a prescribed amount of blood alcohol content while driving. However, this does not preclude the simultaneous existence and use of the older subjective tests in which police officers measure the intoxication of the suspect by asking them to do certain activities or by examining their eyes and responses. BAC is most conveniently measured as a simple percent of alcohol in the blood by weight. Research shows an exponential increase of the relative risk for a crash with a linear increase of BAC as shown in the illustration. BAC does not depend on any units of measurement. In Europe, it is usually expressed as milligrams of alcohol per 100 milliliters of blood. However, 100 milliliters of blood weighs essentially the same as 100 milliliters of water, which weighs precisely 100 grams. Thus, for all practical purposes, this is the same as the simple dimensionless BAC measured as a percent. The per mille (promille) measurement, which is equal to ten times the percentage value, is used in Denmark, Germany, Finland, Norway and Sweden.

Depending on the jurisdiction, BAC may be measured by police using three methods: blood, breath, or urine. For law enforcement purposes, breath is the preferred method, since results are available almost instantaneously. The validity of the testing equipment/methods and mathematical relationships for the measurement of breath and blood alcohol have been criticized. Improper testing and equipment calibration is often used in defense of a DUI or DWI. There have been cases in Canada where officers have come upon a suspect who is unconscious after an accident and officers have taken a blood sample.

Driving while consuming alcohol may be illegal within a jurisdiction. In some it is illegal for an open container of an alcoholic beverage to be in the passenger compartment of a motor vehicle or in some specific area of that compartment. There have been cases of drivers being convicted of a DUI when they were not observed driving after being proven in court they had been driving while under the influence.

In the case of an accident, car insurance may be automatically declared invalid for the intoxicated driver, i.e. the drunk driver is fully responsible for damages. In the American system, a citation for driving under the influence also causes a major increase in car insurance premiums.

The German model serves to reduce the number of accidents by identifying unfit drivers and removing them from until their fitness to drive has been established again. The Medical Psychological Assessment (MPA) works for a prognosis of the fitness for drive in future, has an interdisciplinary basic approach and offers the chance of individual rehabilitation to the offender.

George Smith, a London Taxi cab driver, ended up being the first person to be convicted of driving while intoxicated, on September 10, 1897. He was fined 25 shillings, which is equivalent to £139 in 2018.

Risks

Relative risk of an accident based on blood alcohol levels
 
Percentage of US car crash fatalities where driver blood alcohol level was .01 and above, 1999–2012
 
Driving under the influence is one of the largest risk factors that contribute to traffic collisions. For people in Europe between the age of 15 and 29, driving under the influence is one of the main causes of mortality. According to the National Highway Traffic Safety Administration alcohol-related crashes cause approximately $37 billion in damages annually. DUI and alcohol-related crashes produce an estimated $45 billion in damages every year. Between attorney fees, fines, court fees, ignition interlock devices, and DMV fees a DUI charge could cost thousands to tens of thousands of dollars.

Studies show that a high BAC increases the risk of collisions whereas it is not clear if a BAC of 0.01–0.05% slightly increases or decreases the risk.

Traffic collisions are predominantly caused by driving under the influence for people in Europe between the age of 15 and 29, it is one of the main causes of mortality. According to the National Highway Traffic Safety Administration alcohol-related collisions cause approximately $37 billion in damages annually. Every 51 minutes someone dies from an alcohol-related collision. When it comes to risk-taking there is a larger male to female ratio as personality traits, antisociality and risk-taking are taken into consideration as they all are involved in DUI's. Over 7.7 million underage people ages 12–20 claim to drink alcohol, and on average, for every 100,000 underage Americans, 1.2 died in drunk-driving traffic accidents.

Grand Rapids Dip

Some studies suggest that a BAC of 0.01–0.04% would have a lower risk of collisions compared to a BAC of 0%, referred to as the Grand Rapids Effect or Grand Rapids Dip, based on a seminal research study by Borkenstein, et al. (Robert Frank Borkenstein is well known for inventing the Drunkometer in 1938, and the Breathalyzer in 1954.) One study suggests that a BAC of 0.04–0.05% would slightly increase the risk.

Some literature has attributed the Grand Rapids Effect to erroneous data or asserted (without support) that it was possibly due to drivers exerting extra caution at low BAC levels or to "experience" in drinking. Other explanations are that this effect is at least in part the blocking effect of ethanol excitotoxicity and the effect of alcohol in essential tremor and other movement disorders, but this remains speculative. 

Both the influential study by Borkenstein, et al. and the empirical German data on the 1990s demonstrated that the risk of collisions is lower or the same for drivers with a BAC of 0.04% or less than for drivers with a BAC of 0%. For a BAC of 0.15% the risk is 25-fold. The 0.05% BAC limit in Germany (since 1998, 0.08% since 1973) and the limits in many other countries were set based on the study by Borkenstein, et al. Würzburg University researchers showed that all extra collisions caused by alcohol were due to at least 0.06% BAC, 96% of them due to BAC above 0.08%, and 79% due to BAC above 0.12%. In their study based on the 1990s German data, the effect of alcohol was higher for almost all BAC levels than in Borkenstein, et al.

Other drugs

For drivers suspected of drug-impaired driving, drug testing screens are typically performed in scientific laboratories so that the results will be admissible in evidence at trial. Due to the overwhelming number of impairing substances that are not alcohol, drugs are classified into different categories for detection purposes. Drug impaired drivers still show impairment during the battery of standardized field sobriety tests, but there are additional tests to help detect drug impaired driving. 

The Drug Evaluation and Classification program is designed to detect a drug impaired driver and classify the categories of drugs present in his or her system. The DEC program breaks down detection into a twelve-step process that a government-certified Drug Recognition Expert (DRE) can use to determine the category or categories of drugs that a suspect is impaired by. The twelve steps are:
  1. Breath Alcohol Test
  2. Interview with arresting officer (who notes slurred speech, alcohol on breath, etc.)
  3. Preliminary evaluation
  4. Evaluation of the eyes
  5. Psychomotor tests
  6. Vital signs
  7. Dark room examinations
  8. Muscle tone
  9. Injection sites (for injection of heroin or other drugs)
  10. Interrogation of suspect
  11. Opinion of the evaluator
  12. Toxicological examination
DREs are qualified to offer expert testimony in court that pertains to impaired driving on drugs. The use of the twelve step process is scientifically validated by numerous field studies.

Recreational drugs

Drivers who have smoked or otherwise consumed cannabis products such as marijuana or hashish can be charged and convicted of impaired driving in some jurisdictions. A 2011 study in the B.C. Medical Journal stated that there "...is clear evidence that cannabis, like alcohol, impairs the psychomotor skills required for safe driving." The study stated that while "[c]annabis-impaired drivers tend to drive more slowly and cautiously than drunk drivers,... evidence shows they are also more likely to cause accidents than drug and alcohol-free drivers". In Canada, police forces such as the Royal Canadian Mounted Police have "...specially trained drug recognition and evaluation [DRE] officers... [who] can detect whether or not a driver is drug impaired, by putting suspects through physical examinations and co-ordination tests. In 2014, in the Canadian province of Ontario, Bill 31, the Transportation Statue Law Amendment Act, was introduced to the provincial legislature. Bill 31 contains driver's license "...suspensions for those caught driving under the influence of drugs, or a combination of drugs and alcohol. Ontario police officers "...use Standard Field Sobriety Tests (SFSTs) and drug recognition evaluations to determine whether the officer believes the driver is under the influence of drugs."  In the province of Manitoba, an "...officer can issue a physical coordination test. In B.C., the officer can further order a drug recognition evaluation by an expert, which can be used as evidence of drug use to pursue further charges."

In the US state of Colorado, the state government indicates that "[a]ny amount of marijuana consumption puts you at risk of driving impaired."  Colorado law states that "drivers with five nanograms of active tetrahydrocannabinol (THC) in their whole blood can be prosecuted for driving under the influence (DUI). However, no matter the level of THC, law enforcement officers base arrests on observed impairment." In Colorado, if consumption of marijuana is impairing your ability to drive, "it is illegal for you to be driving, even if that substance is prescribed [by a doctor] or legally acquired." 

Prescription medications

Prescription medications such as opioids and benzodiazepines often cause side effects such as excessive drowsiness, and, in the case of opioids, nausea. Other prescription drugs including antiepileptics and antidepressants are now also believed to have the same effect. In the last ten years, there has been an increase in motor vehicle accidents, and it is believed that the use of impairing prescription drugs has been a major factor. Workers are expected to notify their employer when prescribed such drugs to minimise the risk of motor vehicle accidents while at work. 

If a worker who drives has a health condition which can be treated with opioids, then that person's doctor should be told that driving is a part of the worker's duties and the employer should be told that the worker could be treated with opioids. Workers should not use impairing substances while driving or operating heavy machinery like forklifts or cranes. If the worker is to drive, then the health care provider should not give them opioids. If the worker is to take opioids, then their employer should assign them work which is appropriate for their impaired state and not encourage them to use safety sensitive equipment.

Field sobriety testing

To attempt to determine whether a suspect is impaired, police officers usually will administer field sobriety tests to determine whether the officer has probable cause to arrest an individual for suspicion of driving under the influence (DUI).

A police officer in the United States must have Probable Cause to make an arrest for driving under the influence. In establishing probable cause for a DUI arrest officers frequently consider the suspect's performance of Standardized Field Sobriety Tests. The National Highway Traffic Safety Administration (NHTSA) developed a system for validating field sobriety tests that led to the creation of the Standardized Field Sobriety Test (SFST) battery of tests. The National Highway Traffic Safety Administration (NHTSA) established a standard battery of three roadside tests that are recommended to be administered in a standardized manner in making this arrest decision. There are Non-Standardized Field Sobriety Tests as well; however the Non-Standardized Field Sobriety Tests have not received NHTSA Validation. This is the difference between the "Standardized" and the "Non-Standardized" Field Sobriety Tests. The NHTSA has published numerous training manuals associated with SFSTs. As a result of the NHTSA studies, the Walk-and-Turn test was determined to be 68% accurate in predicting whether a test subject is at or above 0.08%, and the One-Leg Stand Test was determined to be 65% accurate in predicting whether a test subject is at or above 0.08% when the tests are properly administered to people within the study parameters.
The three validated tests by NHTSA are:
  • The Horizontal Gaze Nystagmus Test, which involves following an object with the eyes (such as a pen or other stimulus) to determine characteristic eye movement reaction to the stimulus
  • The Walk-and-Turn Test (heel-to-toe in a straight line). This test is designed to measure a person's ability to follow directions and remember a series of steps while dividing attention between physical and mental tasks.
  • The One-Leg-Stand Test
Alternative tests, which have not been validated by the NHTSA, include the following:
  • The Romberg Test, or the Modified-Position-of-Attention Test, (feet together, head back, eyes closed for thirty seconds).
  • The Finger-to-Nose Test (tip head back, eyes closed, touch the tip of nose with tip of index finger).
  • The Alphabet Test (recite all or part of the alphabet).
  • The Finger Count Test (touch each finger of hand to thumb counting with each touch (1, 2, 3, 4, 4, 3, 2, 1)).
  • The Counting Test (counting backwards from a number ending in a digit other than 5 or 0 and stopping at a number ending in a digit other than 5 or 0. The series of numbers should be more than 15).
  • The Preliminary Alcohol Screening Test, PAS Test or PBT, (breathe into a "portable or preliminary breath tester", PAS Test or PBT).
In the US, field sobriety tests are voluntary; however, some states mandate commercial drivers accept preliminary breath tests (PBT).

Preliminary Breath Test (PBT) or Preliminary Alcohol Screening test (PAS)

The Preliminary Breath Test (PBT) or Preliminary Alcohol Screening test (PAS) is sometimes categorised as part of field sobriety testing, although it is not part of the series of performance tests. The PBT (or PAS) uses a portable breath tester. While the tester provides numerical blood alcohol content (BAC) readings, its primary use is for screening and establishing probable cause for arrest, to invoke the implied consent requirements. In US law, this is necessary to sustain a conviction based on evidential testing (or implied consent refusal). Regardless of the terminology, in order to sustain a conviction based on evidential tests, probable cause must be shown (or the suspect must volunteer to take the evidential test without implied consent requirements being invoked).

Refusal to take a preliminary breath test (PBT) in Michigan subjects a non-commercial driver to a "civil infraction" penalty, with no violation "points", but is not considered to be a refusal under the general "implied consent" law. In some states, the state may present evidence of refusal to take a field sobriety test in court, although this is of questionable probative value in a drunk driving prosecution. 

Different requirements apply in many states to drivers under DUI probation, in which case participation in a preliminary breath test (PBT) may be a condition of probation. Some US states, notably California, have statutes on the books penalizing PBT refusal for drivers under 21; however the Constitutionality of those statutes has not been tested. (As a practical matter, most criminal lawyers advise not engaging in discussion or "justifying" a refusal with the police.)

Commercial drivers are subject to PBT testing in some US states as a "drug screening" requirement.

Testing for cannabis

In the recent wake of legalized marijuana, law enforcement has sought a method of breath testing to determine the content of THC present in an individual. Law enforcement efficiently combats driving under the influence with tools like breathalyzers during field sobriety tests. Excluding edibles, a THC breathalyzer has the potential to measure how "high" an individual may be at the time. The legality of marijuana does not entail safety on the road, and accurate methods have become required to determine driver impairment. A THC breathalyzer could revolutionize roadside sobriety testing for drivers suspected of impairment.

Other charges

In the US state of Colorado, impaired drivers may potentially be charged with child endangerment if they are arrested for DUI with minor children in the vehicle.

Laws by country

The laws relating to drunk driving vary between countries or subnational regions (e.g., states or provinces) and varying blood alcohol content is required before a charge or conviction can be made.

The specific criminal offense may be called, depending on the jurisdiction, "driving under the influence" [of alcohol or other drugs] (DUI), "driving under the influence of intoxicants" (DUII), "driving while impaired" (DWI), "operating vehicle under the influence of alcohol or other drugs" (OVI), "operating under the influence" (OUI), "operating while intoxicated" (OWI), "operating a motor vehicle while intoxicated" (OMVI), "driving under the combined influence of alcohol or other drugs", "driving under the influence per se" or "drunk in charge" [of a vehicle]. Many such laws apply also to motorcycling, boating, piloting aircraft, use of mobile farm equipment such as tractors and combines, riding horses or driving a horse-drawn vehicle, or bicycling, possibly with different BAC level than driving. In some jurisdictions there are separate charges depending on the vehicle used, such as BWI (bicycling while intoxicated), which may carry a lighter sentence.

Some jurisdictions have multiple levels of BAC for different categories of drivers; for example, the state of California has a general 0.08% BAC limit, a lower limit of 0.04% for commercial operators, and a limit of 0.01% for drivers who are under 21 or on probation for previous DUI offenses. In some jurisdictions, impaired drivers who injure or kill another person while driving may face heavier penalties. 

Some jurisdictions have judicial guidelines requiring a mandatory minimum sentence.

DUI convictions may result in multi-year jail terms and other penalties ranging from fines and other financial penalties to forfeiture of one's license plates and vehicle. In many jurisdictions a judge may also order the installation of an ignition interlock device. Some jurisdictions require that drivers convicted of DUI offenses use special license plates that are easily distinguishable from regular plates. These plates are known in popular parlance as "party plates" or "whiskey plates". 

In many countries, sobriety checkpoints (roadblocks of police cars where drivers are checked), driver's licence suspensions, fines and prison sentences for DUI offenders are used as part of an effort to deter impaired driving. In addition, many countries have prevention campaigns that use advertising to make people aware of the danger of driving while impaired and the potential fines and criminal charges, discourage impaired driving, and encourage drivers to take taxis or public transport home after using alcohol or other drugs. In some jurisdictions, a bar or restaurant that serves an impaired driver may face civil liability for injuries caused by that driver. In some countries, non-profit advocacy organizations, a well-known example being Mothers Against Drunk Driving (MADD) run their own publicity campaigns against drunk driving.

Argentina

In Argentina, it is a criminal offence to drive if one's level of alcohol is 0.03% or greater at local/municipal jurisdiction, stopped by a municipal police force and 0.04% if driving on a route or highway and stopped by a State Highway Patrol, Argentina Federal Police, or Argentina Gendarmerie. At the Cordoba State highways and routes, a zero-tolerance police is enforced by Cordoba State Highway Patrol and it is an offence to drive with an alcohol level greater than 0.00%.

Australia

In Australia it is a criminal offence to drive under the influence of alcohol if one's level of alcohol is 0.05% or greater (full licence) or if one's level of alcohol is greater than 0.00% (learner/provisional). Australian police utilise random breath testing stations, and any police vehicle can pull over any vehicle at any time to conduct a random breath or drug test. People found to have excessive alcohol or any banned substances are taken to either a police station or a random breath testing station for further analysis. Those over 0.08% will receive an automatic disqualification of their licence and must appear in court.

Canada

The Federal government of Canada has adopted truth in sentencing laws that enforce strict guidelines on sentencing, differing from previous practice where prison time was reduced or suspended after sentencing had been issued.

In Canada, refusal to blow into a blood alcohol testing device provided by a police officer carries the same penalties as being found guilty of drunk driving.

Commentary varies on taking Standardised Field Sobriety Tests (SFSTs) in Canada. Some sources, especially official ones, indicate that the SFSTs are mandatory, whereas other sources are silent on FST testing. The assertion regarding mandatory compliance with SFSTs is based on "failure to comply with a demand", as an offence under § 254(5) of the Criminal Code, but it is unclear how refusal of SFSTs are treated (provided the suspect agrees to take a chemical test). There are some reports that refusal to submit to an SFST can result in the same penalties as impaired driving.

Nevertheless, it is unclear whether there has ever been a prosecution under this interpretation of "failure to comply with a demand" as applied to SFSTs. Canada Criminal Code § 254(1) and (5) addresses this, but only with respect to chemical testing (breath, blood, etc.)

South Korea

In Republic of Korea, it is crime to drive if one's level of alcohol is .03% or greater. Police often operates sobriety checkpoints without notice in advance, and it is criminal offense to refuse a sobriety test. Driving under influence of alcohol result in suspension or disqualification of driver's license.

United Kingdom

In British law it is a criminal offence to be drunk in charge of a motor vehicle. The definition depends on such things as being in or near the vehicle, and having access to a means of starting the vehicle's engine and driving it away (i.e., the keys to the vehicle).

The UK's drug driving laws were amended in 2015. The changes included a new roadside testing kit, which could detect the presence of cocaine and cannabis in a suspect's saliva and zero tolerance limits for a number of illegal drugs. Limits were also set for certain prescription medications. The laws, however, did not end the use of the field impairment test, but made them more relevant for determining driver impairment by those drugs that are not now covered by the new legislation, or cannot be identified by the limited use of a device, that currently are only authorised for cannabis and cocaine.

United States

La Mesilla Community Center, located in Mesilla, New Mexico, houses a driving while intoxicated (DWI) School

Under the laws of the United States, it is unlawful to drive a motor vehicle when the ability to do so is materially impaired by the consumption of alcohol or other drugs, including prescription medications. For impaired driving charges involving the consumption of alcohol, the blood alcohol level at which impairment is presumed is 0.08, although it is possible to be convicted of impaired driving with a lower blood alcohol level.

For example, the state of California has two basic drunk driving laws with nearly identical criminal penalties:
  • V.C. Sec. 23152(a) - it is a misdemeanor to drive under the influence of alcohol or other drugs.
  • V.C. Sec. 23152(b) - it is a misdemeanor to drive with .08% or more of alcohol in one's blood.
Under the first law, a driver may be convicted of impaired driving based upon their inability to safely operate a motor vehicle, no matter what their blood alcohol level. Under the second law, it is per se unlawful to drive with a blood alcohol level of .08 or greater. 

For commercial drivers, a BAC of 0.04 can result in a DUI or DWI charge. In most states, individuals under 21 years of age are subject to a zero tolerance limit and even a small amount of alcohol can lead to a DUI arrest.

In some cases, it is possible to be charged with a DUI in a parked car if the intoxicated individual is sitting behind the wheel. In some jurisdictions the occupant of a vehicle might be charged with impaired driving even if sleeping in the back seat based on proof of risk that the occupant would put the vehicle in motion while intoxicated. Some states allow for a charge of attempted DUI if an officer can reasonably infer that the defendant intended to drive a vehicle while impaired.

Repeated impaired driving offenses or an impaired driving incident that results in bodily injury to another may trigger more significant penalties, and potentially trigger a felony charge.

Many states in the US have adopted truth in sentencing laws that enforce strict guidelines on sentencing, differing from previous practice where prison time was reduced or suspended after sentencing had been issued.

Some states allow for conviction for impaired driving based upon a measurement of THC, through blood test or urine testing. For example, in Colorado and Washington, driving with a blood level of THC in excess of 5 nanograms can result in a DUI conviction. In Nevada, the legal THC limit is 2 nanograms. It is also possible for a driver to be convicted of impaired driving based upon the officer's observations of impairment, even if the driver is under the legal limit. In states that have not yet established a THC blood level that triggers a presumption of impaired driving, a driver may similarly be convicted of impaired driving based upon the officer's observations and performance on other sobriety tests.

Prevalence

In the United States, local law enforcement agencies made 1,467,300 arrests nationwide for driving under the influence of alcohol in 1996, compared to 1.9 million such arrests during the peak year in 1983. In 1997 an estimated 513,200 DWI offenders were in prison or jail, down from 593,000 in 1990 and up from 270,100 in 1986. In the United States, DUI and alcohol-related collisions produce an estimated $45 billion in damages every year. In some US and German studies BAC level 0.01-0.03% predicted a lower collision risk than BAC 0%, possibly due to extra caution, whereas BACs 0.08% or higher seem to be responsible for almost all extra accidents caused by alcohol. For a BAC of 0.15% the risk is 25-fold.

Implied consent

All U.S. states recognize "implied consent", pursuant to which drivers are deemed to have consented to being tested for intoxication as a condition of their operating motor vehicles on public roadways. Implied consent laws may result in punishment for those who refuse to cooperate with blood alcohol testing after an arrest for suspected impaired driving, including civil consequences such as a driver's license suspension. The State of Kansas found unconstitutional a state law that made it an additional crime to refuse such a test when no court-ordered warrant for testing exists. Under the implied consent law of the State of Michigan, a person who is arrested for drunk driving is required to take a chemical test to determine their blood alcohol content, and refusal will result in six points being added to their driver's license and their driving privileges will be suspended for one year.

Employment policies

Many employers or occupations have their own rules and BAC limits; for example, the United States Federal Railroad Administration and Federal Aviation Administration have a 0.04% limit for train crew and aircrew, respectively. Certain large corporations have their own rules; for example, Union Pacific Railroad has their own BAC limit of 0.02%. that, if violated during a random test or a for-cause test—for example, after an on-duty traffic accident—can result in termination of employment with no chance of future rehire.

Memory and trauma

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