Our highschool started making attendees at football games walk through a "metal detector" several years ago. One Friday night as I stood in line to "get scanned" and enter the stadium, I saw folks handing over pocket knives to the deputies manning the "scanner" before walking through -- then realized that they also HAD to be carrying car keys, coins, metal plates and screws inside their bodies, etc. -- and the scanner never went off once. Suspecting a fake, I strolled right through with no problem carrying a big ol' folder in my pocket. I later confirmed through a friend who was a school board member that they had bought a fake metal detector. Real ones were way too expensive...
So our "stadium security" is just like TSA -- a total fake. Just as a cheap lock only secures things from theft by honest people, airport and stadium security only keep us safe from timid terrorists.