I find it really, really sad that we have to go to such extent in order to ensure a safe environment. I mean don't they even use plastic forks now to make sure kids don't use their silverware to stab someone? Once you start defining everything as a potential weapon, that's when you know kids are seriously messed up..
My school was just like that. We were required to wear our shirts tucked in so that no one can hide a weapon and could not carry around book bags. But that means that some middle school kid had to have brought a gun to school a few times and got caught once, in order for them to even make that a rule...I find that EXTREMELY disturbing.