Something they can carry concealed on their persons.I would recommend either..
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Kel-Tec 2000 mk II or
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Just add optic and a high speed round that fragments in walls (less over penetration.)
I base this on the fact most teachers will not get into a rigorous practice regime and thus a small very light rifle with low recoil and good power. 9mm from 16 inch barrels reaches 1500 fps... i.e. .357 magnum.
What do you guys think they should be armed with?
Ohio armed staff are required to take eight hours refresher training and requal each year in addition to the 29-56 hours of minimum training they have already undergone. The ones I know practice regularly.