I don't think there's any way of knowing if someone's under the influence. I remember reading some where in the guidelines or chat rules that it's stated....maybe someone can help me out lol. Personally I don't drink, since alcoholism runs on my family.
I saw this subject discussed on TV the other day, calling it drunk while texting lol. I think someone was even thinking about a program(for Facebook I think), that could sense words being typed wrong lol. I think a person under the influence could end up embarrassing themselves just like in real life. I wonder how many exes have received that middle of the night text.