Not to be hyper-technical, but nobody saw a bullet anywhere in this episode.
I bet the teacher knows which insects sting and might hurt the kids, and probably knows that if a kid eats paste, its ok - while drinking draino is an emergency.
Why wouldn’t we expect a teacher to have similar rudimentary knowledge about what type of brass colored metal is bad for you? You really can’t use the teacher’s ignorance of what a bullet looks like as an excuse for their over-reaction.
“Not to be hyper-technical, but nobody saw a bullet anywhere in this episode.”
The teacher saw a bullet, and her first responsibility is to protect the other students, so she took it. It doesn’t matter that it turned out to be an empty casing, which wasn’t established until later. She and the principal both followed rules meant to protect other students, and you guys all think she’s stupid for doing that.