Canadian constitutional law (French:droit constitutionnel du Canada) is the area ofCanadian law relating to the interpretation and application of theConstitution of Canada by thecourts. All laws ofCanada, both provincial and federal, must conform to the Constitution and any laws inconsistent with the Constitution have no force or effect.

InReference re Secession of Quebec,^{[nb 1]} the Supreme Court characterized four fundamental and organizing principles of the Constitution (though not exhaustive):federalism;democracy;constitutionalism and therule of law; andprotection of minorities.

Under the authority of section 52(1) of theConstitution Act, 1982, courts may review all matters of law. Accordingly, the courts have a broad scope of competence. Constitutional issues come before the court through disputes between parties as well as throughreference questions. The court has the discretion to hear any constitutional issues as long as there is a sufficient legal component.^{[nb 2]} The U.S. constitutionalpolitical questions doctrine was rejected and so a political dimension to the issue does not bar it from court.^{[nb 3]}

Courts must be careful when considering reference questions. They are required to be careful to only answer questions that are not speculative, of a purely political nature, or unripe.^{[nb 1]} When answering the questions the court must retain its proper role within the constitutional framework.^{[nb 4]}

A party must have standing (locus standi) to bring aconstitutional challenge to the courts. Those who wish to challenge a law can do so in one of several ways. A party who is directly affected by the law that purports to be unconstitutional has standingas of right. Likewise, rights holder may challenge any law that will limit any of their rights. Those who are not protected by a right but are nonetheless prosecuted by that law may challenge it as well.^{[nb 5]}

Public interest groups may also gain standing if they satisfy the requirements of theBorowski test.^{[nb 6]} The group must demonstrate that the law raises a serious constitutional issue, the group has a genuine interest in the matter, and that there is no other reasonable and effective manner in which the issue may be brought before the Court.

In rare cases, the courts have developed substantive rules of constitutional law that are not expressly set out in constitutional texts but rather implied by a number of different principles.

InHunt v T&N plc,^{[nb 7]} the Supreme Court of Canada found that "the integrating character of our constitutional arrangements as they apply to interprovincial mobility" called for the courts of each province to give "full faith and credit" to the judgments of courts of other provinces – even though Canada's constitution does not have an expressFull Faith and Credit Clause. This development was criticized by at least one academic.^[1]

In theProvincial Judges Reference,^{[nb 8]} the Supreme Court found that there was an unwritten constitutional principle that protected a right to judicial salary commissions for provincial court judges.

Since the 1929 ruling inEdwards v Canada (AG), the courts have interpreted the Constitution within the context of society to ensure that it adapts and reflects changes. AsViscount Sankey stated, "TheBritish North America Act planted in Canada a living tree capable of growth and expansion within its natural limits."^{[nb 9]}

The Canadian courts have adopted a liberal approach to the approach of statutory and constitutional interpretation, best expressed in the statement, "Today there is only one principle or approach, namely, the words of an Act are to be read in their entire context and in their grammatical and ordinary sense harmoniously with the scheme of the Act, the object of the Act, and the intention of Parliament."^[2]

InCharter jurisprudence, the "dialogue principle" is wherejudicial review of legislation is said to be part of a "dialogue" between the legislatures and the courts. It specifically involves governments drafting legislation in response to court rulings and courts acknowledging the effort if the new legislation is challenged.

In 1982 theCanadian Charter of Rights and Freedoms was brought into effect. This was not meant to affect the workings of federalism, though some content was moved from section 91 tosection 4 of the Charter. Mainly, the Charter is meant to decrease powers of both levels of government by ensuring both federal and provincial laws respect Charter rights, undersection 32.

The relationship between federalism and the Charter is directly dealt with insection 31, which declares that neither the federal nor provincial governments gain powers under the Charter.

InR v Big M Drug Mart Ltd,^{[nb 5]} it was found that legislation whose purpose is found to violate theCharter cannot be saved even if its effects were found to be inoffensive. If a provision of law cannot be seen to constitute a reasonable limit, demonstrably justifiable in a free and democratic society, it cannot be saved pursuant tosection 1 of theCharter. The determination of s. 1 validity follows theOakes test first expressed inR v Oakes, which follows four parts, of which the last three have been named as the "proportionality test":^{[nb 10]}

1. the reason for the rights violation must be "pressing and substantial"
2. there must be a "rational connection" between the rights-infringing measure and the objective
3. the measure must be the least restrictive means for realizing the objective
4. the deleterious effects of the measure must be proportionate to the importance of the objective

Although modified in subsequent jurisprudence to relax its strictness,^{[nb 11][nb 12]}Oakes continues to be of valid application.^[3]

However, the provincial education power under Section 93 of theConstitution Act, 1867 isplenary, and is not subject toCharter attack, so long as it does not extend beyond the confines of Section 93's mandate to fundRoman Catholic separate schools and public schools.^{[nb 13]}

In order to rationalize how far each jurisdiction may use its authority, certain doctrines have been devised by the courts:

• pith and substance, including the nature of any ancillary powers and the colourability of legislation,
• double aspect,
• paramountcy,
• Crown immunity, and
• interjurisdictional immunity

There are also differences in legislative competence in each of the Provinces, as each had entered Confederation on somewhat different terms. AsViscount Simon of thePrivy Council noted in 1953:

Every province created or to be created must, of course, be a province in the Dominion of Canada, but the Act of 1867 contained no such definition of province as would involve any conflict between that Act and the 1871 Act. There is no complete equality of powers between the four original provinces.^[4]

The pith and substance doctrine is founded on the recognition that it is in practice impossible for a legislature to exercise its jurisdiction over a matter effectively without incidentally affecting matters within the jurisdiction of another level of government.^[5]

Also, some matters are by their very nature impossible to categorize under a single head of power: they may have both provincial and federal aspects. Thedouble aspect doctrine, which applies in the course of a pith and substance analysis, ensures that the policies of the elected legislators of both levels of government are respected, by recognizing that both Parliament and the provincial legislatures can adopt valid legislation on a single subject depending on the perspective from which the legislation is considered (i.e., depending on the various aspects of the matter in question).^[6]

In certain circumstances, however, the powers of one level of government must be protected against intrusions, even incidental ones, by the other level. For this purpose, the courts have developed the doctrines ofinterjurisdictional immunity andfederal paramountcy.^[7]

The Parliament of Canada has power to bind Her Majesty both in right of Canada and of any province, but provincial statutes do not of their own force bind the federal Crown.^{[8][nb 14]} There is considerable debate as to whether interprovincial sovereign immunity exists.^[9]

InRe Upper Churchill Water Rights Reversion Act, an Act of the Newfoundland legislature was held to be unconstitutional because of colourability. While its stated purpose was to cancel a long-term lease and to expropriate power generation assets located in the province, its real purpose was to interfere with civil rights existing outside the province. As noted byMr Justice McIntyre:

Where the pith and substance of the provincial enactment is in relation to matters which fall within the field of provincial legislative competence, incidental or consequential effects on extraprovincial rights will not render the enactmentultra vires. Where, however, the pith and substance of the provincial enactment is the derogation from or elimination of extraprovincial rights then, even if it is cloaked in the proper constitutional form, it will beultra vires. A colourable attempt to preserve the appearance of constitutionality in order to conceal an unconstitutional objective will not save the legislation.^{[nb 15]}

Certain measures that would be constitutionally valid if enacted on their own are invalid if they are combined with other measures that invade unconstitutionally into the other jurisdiction. This is held to beoverreach. As noted byViscount Haldane:

Within the spheres allotted to them by the (B.N.A.) Act the Dominion and the Provinces are rendered on general principle co-ordinate governments. As a consequence where one has legislative power the other has not, speaking broadly, the capacity to pass laws which will interfere with its exercise. What cannot be done directly cannot be done indirectly.^{[nb 16]}

• InReference re Assisted Human Reproduction Act,^{[nb 17]} the federal use of thecriminal law power was found in certain key aspects to overreach too far into the provincial hospitals power, as well as into the more familiar sphere ofproperty and civil rights.
• InReference re Securities Act,^{[nb 18]} a proposed federal law for establishing a national securities regulator was held to overreach, as a whole, too far into theproperty and civil rights power, and was thus wholly unconstitutional.

Multiple Access Ltd v McCutcheon^{[nb 19]} held that, even when federal and provincial laws have been enacted on the same matter by virtue of thedouble aspect doctrine, the doctrine of paramountcy does not necessarily have to be invoked. In that regard,Mr Justice Dickson observed:

The conflict ... lies in large measures upon the opinion ... that the paramountcy doctrine became applicable because a plaintiff could resort to one set of provisions only and, having done so, there would be no scope for the other to have operational effect. That is unquestionably an important consideration but it is not, in my view, conclusive. The provincial legislation merely duplicates the federal; it does not contradict it. The fact that a plaintiff may have a choice of remedies does not mean that the provisions of both levels of government cannot "live together" and operate concurrently.^[10]

Therefore, paramountcy should only be invoked where there is a conflict between the federal and provincial laws in question. There is no danger of double recovery being possible where the laws are not in conflict, as no court would permit it.^[11]

The current approach to determining the constitutionality of legislation is founded inCanadian Western Bank v Alberta,^{[nb 20]} where the Supreme Court of Canada summarized the following principles:

• thepith and substance of the provincial law and the federal law should be examined to ensure that they are both validly enacted laws and to determine the nature of the overlap, if any, between them.
• the applicability of the provincial law to the federal undertaking or matter in question must be resolved with reference to the doctrine ofinterjurisdictional immunity.
• only if both the provincial law and the federal law have been found to be valid pieces of legislation, and only if the provincial law is found to be applicable to the federal matter in question, then both statutes must be compared to determine whether the overlap between them constitutes a conflict sufficient to trigger the application of the doctrine offederal paramountcy.

The burden of proof falls on the party that is alleging paramountcy. AsMr Justice Binnie andMr Justice LeBel noted:

To sum up, the onus is on the party relying on the doctrine offederal paramountcy to demonstrate that the federal and provincial laws are in fact incompatible by establishing either

• that it is impossible to comply with both laws or
• that to apply the provincial law would frustrate the purpose of the federal law.^[12]

Where the constitutionality of legislation is being questioned in relation to the division of powers under theConstitution Act, 1867, an analysis of itspith and substance must be undertaken. This analysis consists of an inquiry into the true nature of the law in question for the purpose of identifying the matter to which it essentially relates.^[13]

• If its pith and substance can be related to a matter that falls within the jurisdiction of the legislature that enacted it, the courts will declare itintra vires.
• If, however, it can more properly be said to relate to a matter that is outside the jurisdiction of that legislature, it will be held to be invalid owing to this violation of the division of powers.
• The corollary to this analysis is that legislation whose pith and substance falls within the jurisdiction of the legislature that enacted it may, at least to a certain extent, affect matters beyond the legislature’s jurisdiction without necessarily being unconstitutional. At this stage of the analysis, the dominant purpose of the legislation is still decisive.
• Merely incidental effects will not disturb the constitutionality of an otherwiseintra vires law.^[14]

InQuebec (AG) v Lacombe, the nature of any ancillary powers arising from thepith and substance of a matter was considered. As noted byChief Justice McLachlin, the Chief Justice:^{[nb 21]}

• The degree of integration required increases in proportion to the seriousness of the encroachment.
• Where the impugned measure encroaches only slightly on the jurisdiction of the other level of government, a rational, functional connection is required.
• As the degree of intrusion grows more serious, the required degree of integration tends toward a test of necessity.
• To meet the test, aprima facie invalid measure must complement rather than merely supplement the legislative scheme. It must, both rationally and in its function, further the purposes of the valid legislative scheme of which it is said to be part.

InQuebec (AG) v Canadian Owners and Pilots Assn ("COPA"), Chief Justice McLachlin outlined a two-step test that must be undertaken to determine ifinterjurisdictional immunity comes into play:^{[nb 22]}

1. Does the provincial law trench on the protected "core" of a federal competence?
2. Is the provincial law's effect on the exercise of the protected federal power sufficiently serious to invoke the doctrine of interjurisdictional immunity?

Though there remains some debate, it has generally been accepted that interjurisdictional immunity applies equally to both the federal and provincial governments. Nevertheless, virtually all of the case law concerns situations where provincial laws encroach on federal matters.^[15] InCanada (AG) v PHS Community Services Society, the Supreme Court expressed caution in employing the doctrine in future cases because:^{[nb 23]}

1. It is in tension with the dominant approach that permits concurrent federal and provincial legislation with respect to a matter.
2. It is in tension with the emergent practice of cooperative federalism.
3. It may overshoot the federal or provincial power in which it is grounded and create legislative "no go" zones where neither level of government regulates.

As Chief Justice McLachlin explained in that decision:

[70] In summary, the doctrine of interjurisdictional immunity is narrow. Its premise of fixed watertight cores is in tension with the evolution of Canadian constitutional interpretation towards the more flexible concepts ofdouble aspect andcooperative federalism. To apply it here would disturb settled competencies and introduce uncertainties for new ones. Quite simply, the doctrine is neither necessary nor helpful in the resolution of the contest here between the federal government and the provincial government.

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