R. v. Hauser, [1979] 1 S.C.R. 984 is a leading Constitutional decision of the Supreme Court of Canada, where, In a four to three decision, the Court upheld the federal Narcotic Control Act as constitutional under the peace, order and good government power. The case is a particularly unusual as the Act had previously held to be constitutional under the Criminal law power in the decision of Industrial Acceptance Corp. v. The Queen [1953] 2 S.C.R. 273.
Pigeon J., writing for the majority, held that the matter of law had sufficient "newness" to fall under the p.o.g.g. power, stating that: