http://washington.cbslocal.com/2013...movement-of-every-vehicle-with-license-plate/
Please note what the police officer quoted in the article says:
Chances are, your local or state police departments have photographs of your car in their files, noting where you were driving on a particular day, even if you never did anything wrong.
Using automated scanners, law enforcement agencies across the country have amassed millions of digital records on the location and movement of every vehicle with a license plate, according to a study published Wednesday by the American Civil Liberties Union. Affixed to police cars, bridges or buildings, the scanners capture images of passing or parked vehicles and note their location, uploading that information into police databases. Departments keep the records for weeks or years, sometimes indefinitely.
Please note what the police officer quoted in the article says:
“There’s no expectation of privacy” for a vehicle driving on a public road or parked in a public place, said Lt. Bill Hedgpeth, a spokesman for the Mesquite Police Department in Texas, which has records stretching back to 2008, although the city plans next month to begin deleting files older than two years. “It’s just a vehicle. It’s just a license plate.”