i've always believed that the line is crossed somewhere in the automation of things we are allowed to do individually. you can go to your local register of deeds and get someone's marriage certificate or information on their home (property location, value, previous owners, etc). i don't have an issue with that until it's automated, where you go to a web site and can check on literally anyone you want in half a second. in the former there is a commitment of time and effort involved that would a) dissuade most individuals from abusing the system and b) make the entire process slow enough that any abuse would be limited. in the latter you can literally get information on hundreds of people per hour. i feel it's the same with these automatic tracking devices. having a cop enter a license plate manually when there is probable cause is a LOT different than having a machine attached to his car do it automatically and store the information. just my two cents.