Past Tense - S1-E4
Corrected entry: Tru thinks that the alcohol has been poisoned, and doesn't realise that it's really the ice until she sees that the stripper has been drinking tequila without ice all night and is fine. But she should have known that the alcohol wasn't poisoned as soon as she found out that one of the men wasn't drinking any alcohol but still died, which happened earlier.
Correction: There was one more person at the party than there were dead. She didn't know who it was and couldn't rule anything out before checking everything.
Knever