FILE - In this Sept. 16, 2012, file phot, a Buffalo Bills' fans read the security screening sign at a security checkpoint before entering the stadium for an NFL football game against the Kansas City Chiefs in Orchard Park, N.Y. 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/Bill Wippert, File)