I think it's a completely stupid policy. I think the people who instituted it are whiny morons. I won't say what I think of the people who enforce it.
That stated, one of my students did bring in a knife (by accident) a few months ago.
**GASP** Oh! The Horror!
I guess it's the accidental part ... I'm not sure I'd trust a fellow who didn't know he had a knife in his front pocket.
I brought my knife to school quite deliberately, every day. My teachers would occasionally ask for help opening boxes and the like.
He was wearing his older brother's jacket.
And you never stabbed anyone? How did you control yourself?
This kid had the knife in the pocket of his heavy coat.