None. I'm sorry but it's lunatic in my view. I don't even trust cops with weapons, not when they're tazing 10 year olds, much less teachers who have to put up with anarchy everyday and probably would be tempted to use the weapon. Also I'm against #1 especially because in 6th grade we put...some sharp object into the teacher's desk drawer as a prank. Now imagine if we saw a gun just casually left in there. That kind of thing would happen somewhere.