My father-in-law recently went on a police "ride-a-long" (we live in Virginia Beach, VA). He said that in between responding to domestic disturbance calls, the majority of the time was spent driving around scanning license plates. Prior to that, he didn't even know the police had the capability, much less the desire to track innocent folks. One particular incident occured that night when they pulled up to a vehicle that came up stolen. The cop pulled the guy over, handcuffed him and put him in the back seat. The guy was upset, and for good reason, which would only become clear some minutes later. He was the owner of the car which had previously been reported as stolen, but had not been cleared in the database after it was returned to him.