the only time it matters what ubstance you are on as a dj is if it affects yuor performance... i once saw a DJ fall own cos he was so pissed (cant remember who it was no one special) that is bad. if you cant handle your piss/pill/whatever you shouldnt be doing it anyway.
but on the flip side, is that work is work, no matter what you do, i wouldnt go to work intoxicated, so maybe other people shouldnt... hmmm food for thought