HUH???????
It sounds like they are addressing the "CCW permit holder" only since Michigan is an "Open Carry" state.
For what it's worth tho, I have a CCW permit and consider myself fairly knowledgable about state firearms laws and all that I've been taught and all that I've read has said that all schools are "gun free zones" meaning no guns at all.........
I learn something every day here......
With that being said, this should also bring up the issue of whether or not a school can prevent a teacher from carrying an open firearm without them being punished for it......