Did people drink them up or were some a little leery? I would wonder about the leaking and also hope that they were washed well before being put in the glasses. My guess is that these are not non-toxic or food grade.
But, in the spirit of having a good time, I would politely drink/sip them unless something tasted funny.
Yes everyone drank them....I guess they assumed there was enough alcohol in them to kill any germs...and I'm sure the plastic is about the same grade as most plastics...you know they actually make these that go inside people's mouths at Halloween...so I'm not sure.