Current releases Traitor [1] and Pineapple Express [2] both feature main characters convinced that they are being tracked and monitored by the police or some government agency. In some cases it's true and in others it's just drug-induced paranoia, but the fear certainly isn't limited to fiction.

I have a friend that is certain that Fastrak, a company that created an electronic toll collection system for Bay Area bridges, is in cahoots with the police and monitors drivers' activity and whereabouts. It's a notion that seems laughable to me, but cell phone carriers are required to provide the ability to trace cell phone calls to a location within 100 meters or less.

For the most part e-tracking is reserved for emergency situations, but the FBI and the U.S. Department of Justice can locate a cellular customer [3] and track their whereabouts. Is this something you consider or worry about?

Source [4]