I have no experience of drugs so I honestly don't know. I do find it odd that there seemed to be quite a few friends out in a group and Libby was the only one so drunk she was denied entry. Most likely just low tolerance of alcohol though. However IF she is still taking antidepressants (which she might not be, but if she was) is there potential for the meds to have caused her to get drunk more quickly? I know in the past I've been on certain meds that you either shouldn't really drink on or absolutely not drink on. Again, most likely just low alcohol tolerance though.What drugs would be relevant, though? I mean, it's possible but unless we're talking about GHB Rohypnol type drug then I'm not sure what difference it would make.