Tuck in your shirt

The narrator assumes every student without their shirt tucked in or baggy jeans carries weapons. However, it seems unrealistic with the amount of guns this guy has on him. Especially, at 0.22 seconds when he pulls out an Uzi and then at 0.27 seconds when he pulls out a shotgun.

I think this video clip is a little extreme. Even with his shirt tucked in, he can still conceal guns in his pockets.