Statutory interpretation is the process by which courts interpret and apply legislation. Some amount of interpretation is often necessary when a case involves a statute. Sometimes the words of a statute have a plain and a straightforward meaning, but in many cases, there is some ambiguity in the words of the statute that must be resolved by the judge. To find the meanings of statutes, judges use various tools and methods of statutory interpretation, including traditional canons of statutory interpretation, legislative history, and purpose. In common law jurisdictions, the judiciary may apply rules of statutory interpretation both to legislation enacted by the legislature and to delegated legislation such as administrative agency regulations.
History Statutory interpretation first became significant in common law systems, of which historically England is the exemplar. In Roman and civil law, a statute (or code) guides the magistrate, but there is no judicial precedent. In England, Parliament historically failed to enact a comprehensive code of legislation, which is why it was left to the courts to develop the common law; and having decided a case and given reasons for the decision, the decision would become binding on later courts. Accordingly, a particular interpretation of a statute would also become binding, and it became necessary to introduce a consistent framework for statutory interpretation. In the construction (interpretation) of statutes, the principal aim of the court must be to carry out the "intention of Parliament", and the English courts developed three main rules (plus some minor ones) to assist them in the task. These were: the mischief rule, the literal rule, and the golden rule. Statutes may be presumed to incorporate certain components, as Parliament is "presumed" to have intended their inclusion. For example:
Offences defined in criminal statutes are presumed to require mens rea (a guilty intention by the accused): Sweet v Parsley. A statute is presumed to make no changes in the common law. A statute is presumed not to remove an individual's liberty, vested rights, or property. A statute is presumed not to apply to the Crown. A statute is presumed not to empower a person to commit a criminal offence. A statute is presumed not to apply retrospectively (whereas the common law is "declaratory": Shaw v DPP). A statute is to be interpreted so as to uphold international treaties to which the UK is a party. In the case of EU law, any statutory provision which contravenes the principle embodied in the EU treaties that EU law is supreme is effectively void: Factortame. It is presumed that a statute will be interpreted ejusdem generis ("of the same kind"), so that words are to be construed in sympathy with their immediate context. Where legislation and case law are in conflict, there is a presumption that legislation takes precedence insofar as there is any inconsistency. In the United Kingdom this principle is known as parliamentary sovereignty; but while Parliament has exclusive competence to legislate, the courts (mindful of their historic role of having developed the entire system of common law) retain sole competence to interpret statutes.
General principles The age old process of application of the enacted law has led to the formulation of certain rules of interpretation. According to Cross, "Interpretation is the process by which the courts determine the meaning of a statutory provision for the purpose of applying it to the situation before them", while Salmond calls it "the process by which the courts seek to ascertain the meaning of the legislature through the medium of authoritative forms in which it is expressed". Interpretation of a particular statute depends upon the degree of creativity applied by the judges or the court in the reading of it, employed to achieve some stated end. It is often mentioned that common law statutes can be interpreted by using the Golden Rule, the Mischief Rule or the Literal Rule. However, according to Francis Bennion, author of texts on statutory interpretation, there are no such simple devices to elucidate complex statutes, "[i]nstead there are a thousand and one interpretative criteria".
Intention of the legislature A statute is an edict of a legislature, and the conventional way of interpreting a statute is to seek the "intention" of its maker of framer. It is the judicature's duty to act upon the true intention of the legislature or the mens or sentential legis. The courts have to objectively determine the interpretation with guidance furnished by the accepted principles. If a statutory provision is open to more than one interpretation the court has to choose that interpretation which represents the true intention of the legislature. The function of the courts is only to expound and not to legislate.
Conflict of laws within a federation
Federal jurisdictions may presume that either federal or local government authority prevails in the absence of a defined rule. In Canada, there are areas of law where provincial governments and the federal government have concurrent jurisdiction. In these cases the federal law is held to be paramount. However, in areas where the Canadian constitution is silent, the federal government does not necessarily have superior jurisdiction. Rather, an area of law that is not expressly mentioned in Canada's Constitution will have to be interpreted to fall under either the federal residual jurisdiction found in the preamble of s. 91—known as the Peace, Order and Good Government clause—or the provinces residual jurisdiction of "Property and Civil Rights" under s. 92(13A) of the 1867 Constitution Act. This contrasts with other federal jurisdictions, notably the United States and Australia, where it is presumed that if legislation is not enacted pursuant to a specific provision of the federal Constitution, the states will have authority over the relevant matter in their respective jurisdictions, unless the state's definitions of their statutes conflicts with federally established or recognized rights
United States
Meaning
The judiciary interprets how legislation should apply in a particular case as no legislation unambiguously and specifically addresses all matters. Legislation may contain uncertainties for a variety of reasons:
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