Now put license plate readers facing every direction on every police car and send that information to a database where it's stored forever. Now link it to every other license plate scanner across the country, and make searching through someone's trips as easy as using a TiVo, with complete history on their location. You don't have to imagine though, because they do this today: http://gothamist.com/2016/01/26/license_plate_readers_nypd.p...