One time in class I remember there had been a big knife roundup and a fellow student didn't like it that my knife didn't get confiscated and said to the teacher "why didn't Tom get his knife taken away?" and the teacher,knowing the deal,said " I didn't see him playing with his knife".
Hell,now if you even have a 22 casing on the dash of your pickup,an empty from a semi auto kicked up there you can get your parking lot rights taken away,or a 3 day suspension,all kinds of crap.