I can't tell you for sure. I think it is under law, but I could be way wrong.
I do know this. Back during the 09 legislature session when some senators tried to push through campus carry, UT Austin responded particularly hostile. The student body council or whatever as well as a bunch of teachers and administrators railed against the legislation. Fighting it politically and attempting(not sure if they succeeded, they probably did but I just don't know for sure) to enact a school policy that prohibited weapons on campus regardless of the law.
Austin is full of miscreant hippies, it is quite depressing.