La Forest went on to caution that "judicial power" is limited so that a court "does not initiate matters and has no agenda of its own". This made him worried about the majority launching into an extensive, unneeded discussion on unwritten principles. He accepted unwritten principles exist, but disputed that limits on government decisions can be found in the preamble. There was no tradition guarding judicial independence against Parliament. Parliamentary supremacy remained important in Britain even after the Act of Settlement; thus British courts cannot invalidate a law, even if the law is generally thought to be wrong. La Forest acknowledged this could be seen as a "technical quibble" since courts in Canada can invalidate laws, but he went on to point out that the Act of Settlement only covered superior judges, and not inferior judges. He also said courts should have clearer grounds for limiting legislative actions, casting previous decisions such as "Switzman v. Elbling" (1957), which relied on the Implied Bill of Rights, into doubt. He pointed to "Attorney General for Canada and Dupond v. Montreal" (1978) as a prior Supreme Court decision questioning the Implied Bill of Rights. If an implied bill of rights existed, it should be found in the creation of Parliament, in section 17 of the Constitution Act, 1867, and should allow for Parliamentary supremacy instead of limiting it.