re: Teacher tells class why there are yellow buckets being brought in for every classroom

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He could replace that bucket with a handgun in a safe and in the rare case either is needed, I feel like the gun would be more effective.

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Screen for the best and the brightest, pay them very well(so we could expect more of them). Train & educate them so they are equipped to deal with today's classrooms, including school shootings.
That would be an investment worth making if we value our children. I know it will never happen but would be a smart move.