GP has a very valid point. We've all seen college students too drunk. Too much alcohol could easily be consumed at, say, a party, leading to someone sexually assaulting the drunk individual. Yes, GHB will "knock out" someone in a way different from alcohol, but considering how ubiquitous alcohol is and how hard it can be for many people to cut themselves off before getting too drunk, I too would personally be more afraid of a college student getting too drunk over getting administered GHB or similar. Not to downplay date-rape drugs, but I just don't think they're nearly as common as alcohol.

Spoken like a man who hasn't paid $5 for access to the jungle juice at a house party hosted by a friend of a friend.