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In this Friday, May 20, 2016 photo, Tyler Cullen, of Vulcan Security Technologies, looks at video screens in the Hartford police Real-Time Crime and Data Intelligence Center in Hartford, Conn. Staff at the center analyze data from surveillance cameras, gunshot detectors, license plate scanners and other sources. Vulcan Security Technologies helped set up the center. Such facilities are proliferating nationwide with the expanded use of surveillance technology, raising some concerns from civil liberties advocates. (AP Photo/Dave Collins)

In this Friday, May 20, 2016 photo, Tyler Cullen, of Vulcan Security Technologies, looks at video screens in the Hartford police Real-Time Crime and Data Intelligence Center in Hartford, Conn. Staff at the center analyze data from surveillance cameras, gunshot detectors, license plate scanners and other sources. Vulcan Security Technologies helped set up the center. Such facilities are proliferating nationwide with the expanded use of surveillance technology, raising some concerns from civil liberties advocates. (AP Photo/Dave Collins)

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