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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. In common law jurisdictions, the traditional approach to determine which jurisdiction's tort law is applicable is the proper law test. When the jurisdiction is in dispute, one or more state laws will be relevant to the decision-making process. If the laws are the same, this will cause no problems, but if there are substantive differences, the choice of which law to apply will produce a different judgment. Each state, therefore, produces a set of rules to guide the choice of law, and one of the most significant rules is that the law to be applied in any given situation will be the proper law. This is the law which seems to have the closest and most real connection to the facts of the case, and so has the best claim to be applied. The general rule is that the proper law is the primary system of law that governs most aspects of the factual situation giving rise to the dispute. This does not imply that all the aspects of the factual circumstances are necessarily governed by the same system of law, but there is a strong presumption that this will be the case (see characterisation). Traditionally, common law jurisdictions such as England required "double actionability" for torts, effectively requiring the conduct to be considered tortious both in England and in the jurisdiction whose law is to apply under the proper law rule.

Over time, the proper law test has been refined or replaced in many common law jurisdictions either with reference to all instances of conflict of laws or specifically in the case of tort law. In English law, with the exception of defamation which continues to apply the proper law test, s10 Private International Law (Miscellaneous Provisions) Act 1995 abolishes the " double actionability " test, and s11 applies the lex loci delicti rule subject to an exception under s12 derived from Boys v Chaplin AC 356 and Red Sea Insurance Co Ltd v Bouygues SA 1 AC 190. Thus, it is no longer necessary for the case to be based on a tort actionable in England. The English courts must apply wider international tests and respect any remedies available under the "Applicable Law" or lex causae including any rules on who may claim (e.g. whether a personal representative may claim for a fatal accident) and who the relevant defendant may be (i.e. the English court would have to apply the applicable law's rules on vicarious liability or the identity of an "occupier" of land). The first step is for the court to decide where the tort occurred, which may be complicated if relevant events took place in more than one state. s11(2) distinguishes between:

In exceptional circumstances, the lex loci delicti rule is displaced in favour of another law, if the "factors relating to the parties" or "any of the events which constitute the tort" show that this other law will be substantially more appropriate.

Within the European Union, there have been efforts to harmonise conflict of tort laws rules between member states. Under Article 3 of the proposed Rome II Regulation on the Law Applicable to Non-Contractual Obligations (22 July 2003), there would be a general presumption that the lex loci delicti will apply subject to either: an exception in Paragraph 2 for the application of the law to any common habitual residence between the parties, or an exception in Paragraph 3 for cases in which "the non-contractual obligation is manifestly more closely connected with another country..." the so-called proximity criterion. In effect, where other specific rules of the regulation are not applied, these general rules replicate the effect of the English rules outlined above. In product liability cases, Article 4 selects the law of the injured party's habitual residence if the product was marketed there with the consent of the defendant. The rationale is that if a defendant knows of, and is benefiting from, sales in the plaintiff 's state, the choice of that state's law is reasonable. Article 6 specifies the lex fori for actions arising out of breach of privacy or defamation, a rule that may increase the risk of forum shopping. Whether the plaintiff has any right of reply in a defamation case will be determined under the law of the state where the broadcaster or publisher is established. In cases where contract and tort issues overlap, Article 9 states that the same law should govern both sets of issues, thus applying contractual choice of law clauses to related tort litigation.

In the United States, where each state constitutes a distinct jurisdiction for the purposes of tort law, different jurisdictions take different approaches to conflict of laws, and rules regarding conflict of tort laws apply equally to conflicts between the tort laws of two American states and conflicts between an American state and a foreign jurisdiction. Until the 20th century, traditional choice of law rules were based on the principle that legal rights vest automatically at legally significant and ascertainable times and places. For example, a dispute regarding property would be decided by the law of the place the property was located. Disputes in tort would be decided by the place where the injury occurred. During the first half of the 20th century, the traditional conflict of laws approach came under criticism from some members of the American legal community who saw it as rigid and arbitrary; the traditional method sometimes forced the application of the laws of a state with no connection to either party, except that a tort or contract claim arose between the parties in that state. This period of intellectual ferment (which coincided with the rise of the legal realism movement) introduced a number of innovative approaches to American choice of laws jurisprudence: