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In this Jan. 16, 2013, file photo, 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. (AP Photo/Danny Johnston, File) **FILE**

In this Jan. 16, 2013, file photo, 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. (AP Photo/Danny Johnston, File) **FILE**

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