Document retrieved by the whistleblower Edward Snowden shows that the Canadian spy agency is tracking airline travelers even days after they left the terminal, just by capturing their device identification. Same capturing devices were implemented throughout the country in all public places, hotels, coffee shops and restaurants, libraries, ground transportation hubs, movie halls etc. to capture the MAC addresses of all collected MAC addresses. The document makes it clear that CSEC intended to share both the technologies and future information generated by it with Canada’s official spying partners the U.S., Britain, New Zealand and Australia.
Source: https://thehackernews.com/2014/01/spying-agencies-tracking-your-location_31.html