Nobody likes details. They're annoying and subject to verification.
I live in a state in which teachers can be armed, so let's see how the details matter.
A district or two allows it, out of hundreds of districts in one of the largest states in the Union, but many cops wouldn't qualify to teach and conceal carry on campus in those districts given the additional requirements imposed on teachers. And yet in those districts, some, no doubt, carry. The district won't say who or how many because they think the uncertainty is important; I have to assume that the district has a dress code that includes jackets for men and more formal clothes for women that often includes a jacket or sweater of some kind. I've seen people try to do the concealed carry "thing" while wearing just jeans and a t-shirt, and it requires a really strained definition of 'concealed'.
At the same time, I'm not aware of ever having met a teacher whose district allowed concealed carry on campus. "Permitted" doesn't mean "required" by any stretch of the imagination--note that in Florida concealed carry is permitted under certain conditions, but it's hardly the case that every adult over the age of 21 is required to undergo training and get a CWP and then actually bear arms. Obviously "permitted" v "required" is not a trivial distinction, so it's not like I'm splitting hairs here.
At least in Texas districts have the final say on whether concealed carry is "permitted". None of the surrounding districts near me permit it. Even if the teacher has a CWP and a million hours of advanced training in safety and shooting and the state of the art everything to enable safe handling and shooting, it's just not allowed. Even to have the gun in its holster, locked in a box in the trunk of a car, unloaded and with no ammo, on a Sunday brings the word "felony" to mind.
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