ALEXANDRIA, Va. — The widespread use of automatic license plate reader technology by local police departments is not only unsettling — it’s unconstitutional, one civil liberties advocate argues.

“One problem is it bypasses the Fourth Amendment,” said John Whitehead, president of the Charlottesville-based, civil-liberties-focused Rutherford Institute.

Automatic license plate readers can capture the date, time and exact location of a vehicle — for up to 1,800 vehicles per minute. That data goes to a central database that can match DMV records and other locations where that license plate was also captured on camera.