I still have 'tattoos' from the sharpened pencils I inadvertently jammed into the palm of my hand while carrying it with the point pointed at my palm.
There are plenty of 'weapons' in school even without a crappy swiss army knife.
Oh yes, even pointy objects like pens and pencils can be weapons. The only writing instruments that should be allowed in publik skrewls are jumbo crayons. And never mind Ritalin, the kids should all be kept in line with Thorazine.
When I was in middle school, some of the students would spend some of their free time fly-tying - as in fishing flies. Get done with some studying, and the tool kits would emerge. Small vises, scissors, tweezers, exacto knives. All probably banned these days under zero tolerance policies. Same kids would these days get expelled for talking about shotgun chokes, dressing a deer, setting traps for ground hogs, etc. The publik skrewls are out to create a generation of nancy-boys.