Ed Snowden and Glenn Greenwald explain things very well. This interview of Snowden is informative.
Snowden describes that once “backdoor access” is established, it is there and available to more than the NSA (if it is an NSA backdoor, for example).
When time permits I will relate this to the extensive data base on Canadians at Statistics Canada. The Government awarded contracts for census work to Lockheed Martin; Lockheed Martin works for the NSA, one of its specialties is surveillance.
You have to be pretty gullible to believe that the FBI/NSA does not have back-coor access to the StatsCan data base on Canadians. Even if StatsCan discontinues the Lockheed contracts.