Yeah, I remember when my old roommate told me about how she had been roofied the night before. She was not a lightweight by any means and after her first drink she started feeling drunk. Thankfully, we lived within walking distance of the bar and her friends were there. She said she grabbed one friend's arm, said something is really wrong, and they practically carried her home.
What’s really scary is that, at least at the time, it was a really popular Friday/weekend bar that everyone went to and it wasn’t the first story I heard about that place.