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 , [1] 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".
The Courts have established several matters that are considered "double aspect" and can be legislated by either provincial or federal government. Those matters include:
Canadian federalism involves the current nature and historical development of the federal system in Canada.
The Implied Bill of Rights is a judicial theory in Canadian jurisprudence that recognizes that certain basic principles are underlying the Constitution of Canada.
Pith and substance is a legal doctrine in Canadian constitutional interpretation used to determine under which head of power a given piece of legislation falls. The doctrine is primarily used when a law is challenged on the basis that one level of government has encroached upon the exclusive jurisdiction of another level of government.
Canadian constitutional law is the area of Canadian law relating to the interpretation and application of the Constitution of Canada by the courts. All laws of Canada, both provincial and federal, must conform to the Constitution and any laws inconsistent with the Constitution have no force or effect.
Section 92(13) of the Constitution Act, 1867, also known as the property and civil rights power, grants the provincial legislatures of Canada the authority to legislate on:
13. Property and Civil Rights in the Province.
Ontario (AG) v Canada (AG), also known as the Local Prohibition Case, is a famous Canadian constitutional decision by the Judicial Committee of the Privy Council, being one of the first cases to enunciate core principles of the federal peace, order and good government power.
Re Board of Commerce Act 1919 and the Combines and Fair Prices Act 1919, commonly known as the Board of Commerce case, is a Canadian constitutional decision of the Judicial Committee of the Privy Council in which the "emergency doctrine" under the federal power of peace, order and good government was first created.
The Canada Temperance Act, also known as the Scott Act, was an Act of the Parliament of Canada passed in 1878, which provided for a national framework for municipalities to opt in by plebiscite to a scheme of prohibition. It was repealed in 1984.
Kirkbi AG v. Ritvik Holdings Inc., popularly known as the Lego Case, is a decision of the Supreme Court of Canada. The Court upheld the constitutionality of section 7(b) of the Trade-marks Act which prohibits the use of confusing marks, as well, on a second issue it was held that the doctrine of functionality applied to unregistered trade-marks.
Caloil Inc v Canada (AG) is a leading constitutional decision of the Supreme Court of Canada on the Trade and Commerce power under section 91(2) of the Constitution Act, 1867. The Court upheld a federal law prohibiting the transport or sale of imported oil in a certain region of Ontario.
In Canadian constitutional law, the doctrine of paramountcy establishes that where there is a conflict between valid provincial and federal laws, the federal law will prevail and the provincial law will be inoperative to the extent that it conflicts with the federal law. Unlike interjurisdictional immunity, which is concerned with the scope of the federal power, paramountcy deals with the way in which that power is exercised.
Section 91(2) of the Constitution Act, 1867, also known as the trade and commerce power, grants the Parliament of Canada the authority to legislate on:
2. The Regulation of Trade and Commerce.
In Canadian Constitutional law, interjurisdictional immunity is the legal doctrine that determines which legislation arising from one level of jurisdiction may be applicable to matters covered at another level. Interjurisdictional immunity is an exception to the pith and substance doctrine, as it stipulates that there is a core to each federal subject matter that cannot be reached by provincial laws. While a provincial law that imposes a tax on banks may be ruled intra vires, as it is not within the protected core of banking, a provincial law that limits the rights of creditors to enforce their debts would strike at such a core and be ruled inapplicable.
Quebec (AG) v Canadian Owners and Pilots Assn, 2010 SCC 39, [2010] 2 SCR 536, also referred to as Quebec v. COPA, is a leading case of the Supreme Court of Canada on determining the applicability of the doctrines of interjurisdictional immunity and federal paramountcy in Canadian constitutional law.
The Preamble to the Constitution Act, 1867 provides:
Whereas the Provinces of Canada, Nova Scotia, and New Brunswick have expressed their Desire to be federally united into One Dominion under the Crown of the United Kingdom of Great Britain and Ireland, with a Constitution similar in Principle to that of the United Kingdom:
And whereas such a Union would conduce to the Welfare of the Provinces and promote the Interests of the British Empire:
And whereas on the Establishment of the Union by Authority of Parliament it is expedient, not only that the Constitution of the Legislative Authority in the Dominion be provided for, but also that the Nature of the Executive Government therein be declared:
And whereas it is expedient that Provision be made for the eventual Admission into the Union of other Parts of British North America:
Reference Re Companies' Creditors Arrangement Act is a decision of the Supreme Court of Canada on the constitutionality of the Companies' Creditors Arrangement Act as part of the bankruptcy and insolvency jurisdiction of the Parliament of Canada.
Marine Services International Ltd v Ryan Estate, 2013 SCC 44 is a leading case of the Supreme Court of Canada concerning the coexistence of Canadian maritime law with provincial jurisdiction over property and civil rights, and it marks a further restriction upon the doctrine of interjurisdictional immunity in Canadian constitutional jurisprudence.
Canada (AG) v Ontario (AG)[1937] UKPC 6, [1937] A.C. 326, also known as the Labour Conventions Reference, is a landmark decision of the Judicial Committee of the Privy Council concerning the distinct nature of federal and provincial jurisdiction in Canadian federalism.
Section 92(14) of the Constitution Act, 1867, also known as the administration of justice power, grants the provincial legislatures of Canada the authority to legislate on:
14. The Administration of Justice in the Province, including the Constitution, Maintenance, and Organization of Provincial Courts, both of Civil and of Criminal Jurisdiction, and including Procedure in Civil Matters in those Courts.
Reference re Pan‑Canadian Securities Regulation, 2018 SCC 48 is a landmark decision of the Supreme Court of Canada, dealing with the Canadian doctrine of cooperative federalism and how it intersects with the power of the Parliament of Canada over trade and commerce, as well as discussing the nature of parliamentary sovereignty in Canada.