In the classes I teach, every firearm is checked by TWO people before class to make sure they are unloaded and safe. Further we don't allow any live ammunition in the classroom.
We only use Simunition or other training aids that are clearly marked as training, with colors.
Just top prevent this sort of scenario.
Woman killed by cop in classroom training accident.
This is fail in so many levels.
But we need to keep guns out of the hands of amateurs, and only in the highly trained cops hands....