A top secret document retrieved by U.S. whistleblower Edward Snowden shows that Canada’s electronic spy agency used information from the free internet service at a major Canadian airport to track the wireless devices of thousands of ordinary airline passengers for days after they left the terminal. Cyber-security expert: “I can’t see any circumstance in which this would not be unlawful, under current Canadian law, under our Charter, under CSEC’s mandates” The spy agency is supposed to be collecting primarily foreign intelligence by intercepting overseas phone and internet traffic.”]