CHICAGO (WLS) -- There is growing concern over the use of license plate reader technology in Illinois, as the secretary of state has ordered one of the nation's largest operators to stop cooperating with federal agencies .

The company, Flock Safety, has now paused its operations with federal users. The chief legal officer told the I-Team there was a communication error, and the company has now paused its operations with federal agencies.

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Automated license-plate reading systems involve cameras that are mounted on police cars and affixed at traffic intersections, meant to scan license plates and match to outstanding warrants.

But Monday, in a video statement, Illinois Secretary of State Alexi Giannoulias said readers operated by

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