Whatever happened to the old "8 hours bottle to throttle" rule? Many years ago a BA 747 Captain was found to be intoxicated on the flight deck, so they performed an experiment with him in the sim and found he flew better pissed than sober!
If this subject was considered scientifically, a one size fits all blood alcohol concentration isn't a reliable indicator of impairment. Experienced long haul pilots are seasoned drinkers, so their tolerance levels of alcohol intoxication aren't the same as someone new to the job with no tolerance to alcohol. Of course, just as with the media, Government nannies don't like spoiling a good story with the facts, and will never admit that it's mostly their hare-brained rules and regulations that drive most people to drink in the first place in an attempt to deal with the bull****.