CH4,
How the hell does a pilot know if he is breaching the limit?
I'll tell you how. By staying off the sherbets and not drinking anything vaguely alcoholic before piloting an aircraft, especially one thats carrying 100+ passengers who expect the Captain to be sober!
If people can't have a good night out without getting tanked up, then they havent got much of a life..
P.S I'm not some freaky temperence campaigner by the way. I do like a pint or three (of proper beer, not that cheap foreign piss), but in the right circumstances..
Hic..