Pittsburgh Steelers defensive lineman Brett Keisel hops down from a tractor as he drove on campus for his arrival for NFL football training camp at the team' training facility in Latrobe, Pa., on Wednesday, July 25, 2012 . (AP Photo/Keith Srakocic)

Green Bay Packers offensive tackle Ray Dominguez (73) carries a young girls bike as she carries his helmet before NFL football training camp Thursday, July. 26, 2012, in Green Bay, Wis. (AP Photo/Mike Roemer)

Atlanta Falcons defensive back Thomas DeCoud jokes with photographers as he reports for NFL football training camp, Wednesday, July 25, 2012 in Flowery Branch, Ga.. The Falcons open camp on Thursday morning. (AP Photo/John Bazemore)

Atlanta Falcons linebacker Stephen Nicholas jokes with reporters as he reports for NFL football training camp, Wednesday, July 25, 2012 in Flowery Branch, Ga.. The Falcons open camp on Thursday morning. (AP Photo/John Bazemore)

Pittsburgh Steelers defensive back Keenan Lewis gets out of a Smart car as he arrives for NFL football training camp in Latrobe, Pa., on Wednesday, July 25, 2012. (AP Photo/Keith Srakocic)

Reporters are reflected in the sunglasses of Pittsburgh Steelers defensive lineman Brett Keisel as he is interviewed at his arrival for NFL football training camp at the team's training facility in Latrobe, Pa., Wednesday, July 25, 2012. (AP Photo/Keith Srakocic)

Pittsburgh Steelers defensive lineman Brett Keisel, right, walks away from the tractor he drove for his arrival for NFL football training camp at the team's training facility in Latrobe, Pa., Wednesday, July 25, 2012. (AP Photo/Keith Srakocic)

Jamel Brandon, of E&S Security, brings a safe into a dormitory building for Carolina Panthers players to use, as they arrive at Wofford College for the beginning of the NFL team's football training camp in Spartanburg, S.C., Friday, July 27, 2012. (AP Photo/Chuck Burton)

Carolina Panthers' Andre Neblett arrives at Wofford College for the beginning of the NFL team's football training camp in Spartanburg, S.C., Friday, July 27, 2012. (AP Photo/Chuck Burton)

Carolina Panthers' Derek Anderson arrives at Wofford College for the beginning of the NFL team's football training camp in Spartanburg, S.C., Friday, July 27, 2012. (AP Photo/Chuck Burton)

Carolina Panthers' Greg Olsen carries bedding as he arrives at Wofford College for the beginning of the NFL team's football training camp in Spartanburg, S.C., Friday, July 27, 2012. (AP Photo/Chuck Burton)

Carolina Panthers' Steve Smith arrives for the NFL team's football training camp in Spartanburg, S.C., Friday, July 27, 2012. Smith announced he is donating $100,000 to help the survivors of the movie-theater shooting in Colorado pay for medical expenses.(AP Photo/Chuck Burton)

Carolina Panthers' Steve Smith arrives for the NFL team's football training camp in Spartanburg, S.C., Friday, July 27, 2012. Smith announced he is donating $100,000 to help the survivors of the movie-theater shooting in Colorado pay for medical expenses.(AP Photo/Chuck Burton)