FILE - In this Oct. 2, 2011, file photo, fans wait at a security checkpoint as they enter Lambeau Field for an NFL football game between the Denver Broncos and the Green Bay Packers in Green Bay, Wis. The NFL is tightening stadium security starting this preseason, limiting the size and type of bags fans can bring to the game. The restrictions are designed to enhance security while speeding up entry into stadiums. (AP Photo/Mike Roemer, File)