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I agree, the expert on eye witness testimony is likely to testify about the impact of "how awake a person was" and "how dark it was in the hallway," etc.
But the defense doesn't need to accuse a witness of having been impaired, nor do they need to ask the witness this question directly. They can put other witnesses on the stand who have testimony to that effect from parties or other events that night, etc. They don't need to confront a witness directly, thus alienating the jury for this kind of action.
I doubt that a random party-goer is going to be a witness as to what exactly was inside the cups held by the housemates at the party. How would they know? I suppose if everyone was standing around drinking from a keg, they could know that beer had been sipped - but how much? People get cups and put them down and do not resume drinking them. Both of the housemates returned home fairly early, compared to the victims.
I would not be able to swear under oath that I knew someone was drinking alcohol just because they had a plastic cup in their hands. It could be soda. I'd have to watch the pour a mixed drink or get a beer from the keg, but I doubt anyone is going to then watch carefully, at a party, to see how much of the cup was drained. Not everyone drinks to drunkenness, even at a college party.
Plus, 4-5 hours would have passed since that last drink at the party. We do not even know that the two housemates partied at all that night. As a juror, I would not trust the testimony of another partier about who was drinking what. It makes no sense to use one drunken witness to impeach another drunken witness.
How is the defense going to prove that their own witness (if such exists) was sober? They have to put that person on their witness list, then the State gets to go and investigate the relevant party. There could be other witnesses who can be brought to show that Defense Witness was also drinking. It's Russian Dolls. Really weakens, rather than strengthens, the Defense's case.
IMO.