More likely is that one of them will leave it in the bathroom after having removed it to take a shit. Happens a decent amount of times with school resource officers.
That's some after the fact shit. After the commoners were already violated, because the cops won't or can't and definitely have no interest in protecting them.
How many are in prison for violence against the powerful?
In my experience, it's my brother-in-law. His testimony was an important part of a case that put 22 people in jail for actually planning an actual mass murder. Actual bad people, actual plans, actual schedules, actual gear.
He's a cop, one of a few in my family (we're more a firemen/infantry family).
If thats okay with you, I'm going to disagree with your assessment of his character.
So he hasn't been forced out or realized what he's participating in yet. It's not that hard to figure out. If he sticks around it'll become more apparent.
Or a good teacher who knows they're neither trained nor paid enough to warrant the responsibility will keep it locked up very tightly and in the panic forget the code / lose the key, and then they'll be the scapegoat after everything ends.
Or the principal when the teacher's request for more supplies and fewer students per class is met with some dismissive and insulting excuse. No one will care then, either.
The price of America's Freedom to Murder is exactly what you think: dead people.