Having a firearm in your residence is a tricky one as you go state to state. In Minnesota you can not regulate firearms as a landlord. Sounds simple, but you also can not have firearms on school property except under certain conditions. Is a dorm a residence or school property?
Here is the biggest thing in Minnesota law, if I notify the Superintendent, Dean, or person with the highest title, they can grant permission. My letter to our local schools is written to state that I will carry, the purpose, my credentials, and that if I do not receive a response written denial by a set date the permission is granted. This letter with documentation is sent, and the Form 3811 is kept with photo copies of everything contained in the packet.
This is how we do it with the State Capitol complex, courthouses, and schools around here.
It is sad that our very own government ignores the Constitution of the United States in this matter, but as long as we know it is out there we need to play the game. Sad they are expelled, but did they break a written agreement with the school or ignore the proper way of doing thiings?