Of course, OP not realizing most P5 college venues are going to some form of screening using metal detectors and even the SEC mandated the use by 2020 (not sure if Covid put that on pause) in basketball and football arenas/stadiums. I saw an article from UT that said TBA would have them in 2019.
If Va Tech or UNC aren't using them, they are the ones that accept responsibility for an active shooter situation. Both of those schools have the money to pay for the detector units and staffing required of them. It's not going to be easy to go into court during a class action lawsuit and say "well, it wasn't mandatory and we put up no weapons signs!"
If a school as
small as Boise State can afford it seven years ago, there is no reason anyone in a P5 conference can use the excuse they are too expensive.