I worked security for a festival once. It was a great experience actually.
At first the rules for us peons was:
Rule version 1: If you see any drugs report it.
Pretty soon this became ridiculous so the rule changed:
Rule v.2: If you see and drugs being sold or if you see large amounts of drugs likely to be sold then report it.
This had to be revised as well.
Rule v.3: If you see any hard drugs (heroin, coke/crack, meth, LSD, PCP, etc.) being sold then report it.
Finally even this had to be revised giving us the final version:
Rue v.4: If you see any Nitrous then report it.
That was the final version of the rule. Weird, eh? Nitrous which lasts 45 seconds and whose side effects include pretty much only giggling. The only thing I can think of is that they were just pissed at how many hits a dealer could bring into the venue in a compressed cylinder and consequently how much money he could make. Such a weird thing to be all petty about though.