Office Dennis Vafier of the Alexandria Police Dept., uses a laptop in his squad car to scan vehicle license plates during his patrols, Tuesday, July 16, 2013 in Alexandria, Va. Local police departments across the country have amassed millions of digital records on the location and movements of vehicles with a license plate using automated scanners. Affixed to police cars, bridges or buildings, the scanners capture images of passing or parked vehicles and note their location, dumping that information into police databases. Departments keep the records for weeks or even years. (AP Photo/Pablo Martinez Monsivais)
