Double aspect

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Double aspect is a legal doctrine in Canadian constitutional law that allows for laws to be created by both provincial and federal governments in relation to the same subject matter. Typically, the federalist system assigns subject matters of legislation to a single head of power. However, certain matters have several dimensions to them such that for one purpose the matter will fall to one head of power, while for another purpose it will fall to the other. For example, highway traffic laws fall into the property and civil rights power of the province but equally can be a criminal offence which is in the criminal law power of the federal government.

The origin of the doctrine comes from the Privy Council decision of Hodge v. The Queen (1883), where it was stated that "subjects which in one aspect and for one purpose fall within s. 92, may in another aspect and for another purpose fall within s. 91".

[edit] Matters of double aspect

The Courts have established several matters that are considered "double aspect" and can be legislated by either provincial or federal government. Those matters include:

[edit] Reference

  • Peter Hogg, Constitutional law of Canada, section 15.5(c)


Constitution Act, 1867
Division of powers | Peace, order and good government | Criminal law power | Trade and Commerce clause | Works and Undertakings | Property and civil rights | Disallowance and reservation

Canada Act 1982
Constitution Act, 1982
Canadian Charter of Rights and Freedoms | Aboriginal Rights clause | Amending formula

List of Canadian constitutional documents

History of the Constitution
Royal Proclamation of 1763 | Quebec Act | Constitutional Act of 1791 | Act of Union 1840 | British North America Acts | Statute of Westminster 1931
Constitutional debate
Fulton-Favreau formula | Victoria Charter | Meech Lake Accord | Charlottetown Accord | Calgary Declaration | Other unsuccessful amendments
Interpretation of the Constitution
Pith and substance | Double aspect | Paramountcy | Living tree | Implied Bill of Rights | Dialogue principle | Interjurisdictional immunity