FILE - In this Dec. 23, 2012 file photo, referee Al Riverson steps out of the instant replay tent during the second quarter of an NFL football game between the Denver Broncos and the Cleveland Browns, in Denver. League owners passed a rule Tuesday, March 25, 2014, allowing referees to consult with director of officiating Dean Blandino and his staff to help determine whether a call should be upheld or overturned. NFL officials said the change should speed up the process. (AP Photo/Jack Dempsey, File)
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