I know very little about guns and ammunition and I know a little about construction tools but I need some help. 13 year old boy in school pulls out of his pocket and shows a classmate a handful of "ammunition." Teacher sees it, calls the police, boy is suspended pending an expulsion hearing for bringing bullets to school. Boy claims they are shells used for firing nails into concrete. Says no one was in danger. I've seen those at Home Depot. Are they not basically a .22 shell with the end crimped instead of a bullet? Are these the same as "blanks?" Are they also used in starter pistols at the track meet?