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@Alec
What happens when some methed up student/faculty member/etc decides to take said consenting teacher's firearm? All the training in the world can't rule out a surprise grab.... Happens to police, who are very well trained in gun safety.
Yes, having an armed teacher may very well prevent some deaths, BUT they are not infallible. They can make mistakes too, like any other human with a gun.
And while I support gun safety legislation, I do NOT support repealing the 2A.