By Cristin Schmitz ( May 30, 2025, 5:06 PM EDT) -- In a judgment that turns on the application of the constitutional doctrine of interjurisdictional immunity, the Supreme Court of Canada has ruled 9-0 that Quebec’s Private Security Act (PSA) does not apply to two companies that engage in airport and marine port security in the province because the Quebec law impairs activities at the core of exclusive federal jurisdiction over aeronautics, navigation and shipping....