what always got me in Airworthiness notices was the fact we were supposed to be able to determine ourselves if we were fit to do the job if alcohol or drugs had been used......... tell that to a plod giving you a breathalyser........ I am perfectly capable of driving this car, after all I have just signed out an airliner with a bunch of pax on..........
OK not a real case senario, but you know where I am coming from.......