The Canadian Charter of Rights and Freedoms (also known as The Charter of Rights and Freedoms or simply The Charter) is a bill of rights entrenched in the Constitution of Canada. It forms the first part of the Constitution Act, 1982. The Charter guarantees certain political and civil rights of people in Canada from the policies and actions of all levels of government. It is designed to unify Canadians around a set of principles that embody those rights.
The Charter was preceded by the Canadian Bill of Rights, which was enacted in 1960. However, the Bill of Rights was only a federal statute, rather than a constitutional document. As a federal statute, it was limited in scope, it was easily amendable by Parliament and it had no application to provincial laws. The Supreme Court of Canada also narrowly interpreted the Bill of Rights and the Court was reluctant to declare laws inoperative. The British Parliament formally enacted the Charter as a part of the Canada Act 1982 at the request of the Parliament of Canada in 1982, the result of the efforts of the Government of Prime Minister Pierre Trudeau.
One of the most notable effects of the adoption of the Charter was to greatly expand the scope of judicial review, because the Charter is more explicit with respect to the guarantee of rights and the role of judges in enforcing them than was the Bill of Rights. The courts, when confronted with violations of Charter rights, have struck down unconstitutional federal and provincial statutes and regulations or parts of statutes and regulations, as they did when Canadian case law was primarily concerned with resolving issues of federalism. However, the Charter granted new powers to the courts to enforce remedies that are more creative and to exclude more evidence in trials. These powers are greater than what was typical under the common law and under a system of government that, influenced by Canada's mother country the United Kingdom, was based upon Parliamentary supremacy. As a result, the Charter has attracted both broad support from a majority of the Canadian electorate and criticisms by opponents of increased judicial power. The Charter only applies to government laws and actions (including the laws and actions of federal, provincial, and municipal governments and public school boards), and sometimes to the common law, not to private activity.

Features
Many of the rights and freedoms that are protected under the Charter, including the rights to freedom of speech, habeas corpus and the presumption of innocence,

History
The task of interpreting and enforcing the Charter falls to the courts, with the Supreme Court of Canada being the ultimate authority on the matter.
With the Charter's supremacy confirmed by section 52 of the Constitution Act, 1982, the courts continued their practice of striking down unconstitutional statutes or parts of statutes as they had with earlier case law regarding federalism. However, under section 24 of the Charter, courts also gained new powers to enforce creative remedies and exclude more evidence in trials. Courts have since made many important decisions, including R. v. Morgentaler (1988), which struck down Canada's abortion law, and Vriend v. Alberta (1998), in which the Supreme Court found the province's exclusion of homosexuals from protection against discrimination violated section 15. In the latter case, the Court then read the protection into the law.
Courts may receive Charter questions in a number of ways. Rights claimants could be prosecuted under a criminal law that they argue is unconstitutional. Others may feel government services and policies are not being dispensed in accordance with the Charter, and apply to lower-level courts for injunctions against the government (as was the case in Doucet-Boudreau v. Nova Scotia (Minister of Education)). A government may also raise questions of rights by submitting reference questions to higher-level courts; for example, Prime Minister Paul Martin's government approached the Supreme Court with Charter questions as well as federalism concerns in the case Re Same-Sex Marriage (2004). Provinces may also do this with their superior courts. The government of Prince Edward Island initiated the Provincial Judges Reference by asking its provincial Supreme Court a question on judicial independence under section 11.
In several important cases, judges developed various tests and precedents for interpreting specific provisions of the Charter. These include the Oakes test for section 1, set out in the case R. v. Oakes (1986), and the Law test for section 15, developed in Law v. Canada (1999). Since Re B.C. Motor Vehicle Act (1985), various approaches to defining and expanding the scope of fundamental justice (the Canadian name for natural justice or due process) under section 7 have been adopted. (For more information, see the articles on each Charter section).
In general, courts have embraced a purposive interpretation of Charter rights. This means that since early cases like Hunter v. Southam (1984) and R. v. Big M Drug Mart (1985), they have concentrated not on the traditional, limited understanding of what each right meant when the Charter was adopted in 1982, but rather on changing the scope of rights as appropriate to fit their broader purpose. This is tied to the generous interpretation of rights, as the purpose of the Charter provisions is assumed to be to increase rights and freedoms of people in a variety of circumstances, at the expense of the government powers. Constitutional scholar Peter Hogg has approved of the generous approach in some cases, although for others he argues the purpose of the provisions was not to achieve a set of rights as broad as courts have imagined.
Public interest groups frequently intervene in cases to make arguments on how to interpret the Charter. Some examples are the Canadian Civil Liberties Association, the Canadian Mental Health Association, the Canadian Labour Congress, the Women's Legal Education and Action Fund (LEAF), and REAL Women of Canada. The purpose of such interventions is to assist the court and to attempt to influence the court to render a decision favourable to the legal interests of the group.
A further approach to the Charter, taken by the courts, is the dialogue principle, which involves greater participation by elected governments. This approach involves governments drafting legislation in response to court rulings and courts acknowledging the effort if the new legislation is challenged.

Interpretation and enforcement
Some Canadian Members of Parliament saw the movement to entrench a charter as contrary to the British model of Parliamentary supremacy. Others would say that the European Convention on Human Rights has now limited British parliamentary power to a greater degree than the Canadian Charter limited the power of the Canadian Parliament and provincial legislatures. Hogg has speculated that the British adopted the European Convention partly because they were inspired by the similar Canadian Charter.

Comparisons with other human rights instruments
The Charter was intended to be a source for national values and national unity. As Professor Alan Cairns noted, "The initial federal government premise was on developing a pan-Canadian identity."

The Charter and national values
While the Charter has enjoyed a great deal of popularity, with 82% of Canadians describing it as a "good thing" in opinion polls in 1987 and 1999,