Very, very sad mate
I am in the clubbing industry and we have had problems with spiked drinks in the past.
Allthough our doormen search all that enter, its impossible to find everything like pills etc...
We now give out drink spiking test kits on request and also have many posters in the club warning about leaving drinks unattended.
We also recomend that drinks are purchased by the person who is consuming it.
Unfortunately, this sort of thing is hard to stop especially when it could be someone you know as well as a stranger.
Thankfully, we have never caught anyone doing this because I dont think the police would be called......
Low life scum !