From the way a lot of people are talking you'd think this scanner follows every car all around town and records every visited location. That's not what it does, though. It sits on top of the squad car like a radar gun and scans license plates, then compares them with a list of stolen cars and licenses owned by wanted felons. It's not listing everywhere your car went, it's not a police version of your travel plans, it's showing one place that you went, probably just some random road where the policeman is looking for speeders. I don't understand how anyone's privacy is violated, unless you don't want the cops to know that you were driving down Periwinkle Lane last Thursday at 4, or you think that criminals have the right to not be apprehended following a computer-assisted process. Perhaps the database shouldn't be permanent, or maybe it should only save matches, but the information of where your car was at any given time, seen only be police (and none of the police care enough to look at it, probably. They'd rather let the auto-matching to the work) is harmless unless you stole the car or you're a wanted criminal, in which case there shouldn't be any expectation of license plate privacy.