R v Ferguson 2008 SCC 6
 A final cost of constitutional exemptions from mandatory minimum sentence laws is to the institutional value of effective law making and the proper roles of Parliament and the courts. Allowing unconstitutional laws to remain on the books deprives Parliament of certainty as to the constitutionality of the law in question and thus of the opportunity to remedy it. Legislatures need clear guidance from the courts as to what is constitutionally permissible and what must be done to remedy legislation that is found to be constitutionally infirm. In granting constitutional exemptions, courts would be altering the state of the law on constitutional grounds without giving clear guidance to Parliament as to what the Constitution requires in the circumstances: Rosenberg and Perrault, at p. 391. Bad law, fixed up on a case-by-case basis by the courts, does not accord with the role and responsibility of Parliament to enact constitutional laws for the people of Canada.