I note that Sunnydale didn't seem to have any street sleepers, and no-one would wish to be unconscious there much past sunset. Therefore, given that privately operated drunk catchers would inevitably screw up and end up killing diabetics, stroke victims and others who have collapsed incoherant for medical reasons (because sheer greed has never worked when it comes to the management of human behaviour, and human health) I suggest we cut to the chase and just GM some vampires.