I'm not saying it is ok to fly drunk, but I'd be willing to bet that a guy flying with .03% is just as safe if not safer than the guy on leg 7 and duty hour 15:30... I'm too lazy to look it up right now, but I remember reading something a few years ago where the article compared alertness of tired/fatigued humans to those impaired by booze. It even broke down and had hours awake alertness compared to a BAC level alertness.

I've always wanted to do a study, but I know it will never happen, but I'd like to do a "sober/rested" checkride to set up a baseline, then do a checkride after 7 legs and 15 hours of duty, and then a checkride after a few beers. I have a feeling that the tired checkride and beer checkride would look eerily similar... To the point where looking at the ILS print outs it would probably be hard to tell which one was wobbly due to being tired and which was wobbly due to beers.