I don't know what evidence they have, perhaps only the ashes I may not have washed completly down the sink or I left some herb on the counter perhaps. I don't think they smelled it, but I could be mistaken.

I smoked in the bathroom with the shower on full heat so the steam and smoke would combine and be carried out the exhaust in the bathroom. In either case I can't dispute that I was smoking in the room, I really don't know how they determined that though. I left my stuff in the room while I went out, maybe someone was actually in my room and saw it in the drawaer...I think that is unlikly though.