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.

That’s exactly why the place was targeted. If it were some deserted neighborhood dive bar with only three regulars in it, it wouldn’t be hard to figure out who slipped the roofie. The guys who do this target places with large crowds, where no one can know everyone, and where they can slip in and out without being remembered. They just want to be another face in the crowd. It’s hard to grab a roofied girl and pull the whole, “my friend is drunk, I’m going to take her home now” bit if it’s a tight-knit bar where everyone knows everyone. And ultimately, from the point of view of the predator, there’s no point in roofieing someone if you can’t bring them home with you. The roofie is a means to an end, not an end in itself.