Well, in this part of the world, one of our pilots just got canned for drinking within the 12 hour rule on a layover. How was he found out? A company captain on another trip dropped a call back to the company. Didn't tell the guy to "close shop". Just called the company. Next morning they hit him with the test at pickup time. Was over the limit by a bit. Said they would test him at the airport and he passed-too late, even though officially duty doesn't start until one hour before departure. Company says in uniform at pickup is start of duty.

You guys be very careful when you are overseas, especially at LHR. They are watching and looking and love to nail a US pilot.