In this photo taken Jan. 16, 2013, a camera is mounted near the rear window of a police car in Little Rock, Ark. The device is part of a system that scans traffic on the streets, relaying the data it collects to a computer for sifting. Police say the surveillance helps identify stolen cars and drivers with outstanding arrest warrants. (AP Photo/Danny Johnston)

Associated Press
In this photo taken Jan. 16, 2013, a camera is mounted near the rear window of a police car in Little Rock, Ark. The device is part of a system that scans traffic on the streets, relaying the data it collects to a computer for sifting. Police say the surveillance helps identify stolen cars and drivers with outstanding arrest warrants. (AP Photo/Danny Johnston)
In this photo taken Jan. 16, 2013, a camera is mounted near the rear window of a police car in Little Rock, Ark. The device is part of a system that scans traffic on the streets, relaying the data it collects to a computer for sifting. Police say the surveillance helps identify stolen cars and drivers with outstanding arrest warrants. (AP Photo/Danny Johnston)
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