What if your employer is the public school system? I heard it was different for teachers.
I am a teacher at Tulsa Tech and was told that we could not have a firearm in a locked vehicle, and if caught could be terminated and fined up to 3500 dollars. Colleges are different, as long as the gun is in your locked car you are OK. My uncle says he would rather be tried by twelve than carried by six, and I will have to agree.
Read the SDA again, you can not have a firearm on school property including the parking lot, whether you are a visitor, parent, teacher, custodian, anywhere in the parking lot is a no no......