FILE - In this Dec. 24, 2011, photo, referee Ed Hochuli signals during the second quarter of an NFL game between the Detroit Lions and the San Diego Chargers in Detroit. The NFL and referees' union reached a tentative agreement on Wednesday, Sept. 26, 2012, to end a three-month lockout that triggered a wave of frustration and anger over replacement officials and threatened to disrupt the rest of the season. (AP Photo/Carlos Osorio, File)

Photo by: Carlos Osorio

FILE - In this Dec. 24, 2011, photo, referee Ed Hochuli signals during the second quarter of an NFL game between the Detroit Lions and the San Diego Chargers in Detroit. The NFL and referees' union reached a tentative agreement on Wednesday, Sept. 26, 2012, to end a three-month lockout that triggered a wave of frustration and anger over replacement officials and threatened to disrupt the rest of the season. (AP Photo/Carlos Osorio, File)