Deny everything, they cant prove where smoke came from.

You have to put them on the hot seat, whats procedure, was it followed, was it updated or written for hippys protesting way back when. Government like the campus is not going to back down, and they dont say " lets just forget about this whole incident ok".
Crap your in CA, your sort of screwed. A kid was about to bring me some clones and somehow cops came and he gets busted with the clones. He has his recomendation but the just throw out his student loans are history because of this.

Dont just smoke another bowl like its not serious, not many people pay cash when they register each semester so get your facts straight and defend yourself. You can use the empty cardboard roll from toilet paper, stick 1 or 2 fabric softner dryer sheets inside and when you exhale blow it in the roll. Used that trick for years.