Hi, EASA pilot here, so take everything I say with a grain of salt, there are differences between our regulations. FAA 103.17 says “unless that person has prior authorisation” therefore technically it is possible to go gliding there if ATC permits. Of course that is unlikely given the current traffic situation that you described. As far as I can see there aren’t any clubs or flight schools there either. My theory is that since its subject to authorisation, there’s no reason to remove it, and if there’s a change in the traffic situation or there’s a special occasion, the already established gliding area keeps the activities organised.
They absolutely do not care about drug use, only the identity of the user
https://en.m.wikipedia.org/wiki/Fair_Sentencing_Act