It is SEC a ban but I imagine any school can enforce a ban on them if they wanted. Memphis, being SEC want-to-be and all, tried to enforce no cowbells last time we played there. I had an usher come up to me in the stands and ask me to leave because of the cowbell. I said no. They threatened to get the cops. I said OK and was being escorted down the portal. I got near the gate and noticed my escort was gone. I turned around and went back to my seat with the cowbell.