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. This case is 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.