If they already have a CCP and their own weapon to carry. I don't want to force teachers who don't want to carry guns to do so, nor should guns be handed out like candy. There should also be a trained officer or 2, but having some teachers with guns isn't a horrible idea. This way schools are safer, and chances of accidental shootings only marginally increase because only those teachers competent to carry a gun are allowed to do so.
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I don't see why if they own it legally that they shouldn't be able to. Although the risk of it ending up in the hands of a child because of someone not acting responsibly doesn't really sit well.