FL,
Just to illustrate your point, in the offshore helicopter industry in Africa, there is a routine, random drug and alchohol testing policy in effect. This is at the insistence of some client oil companies. Pilots can refuse to agree to be tested, but if they do, they have to leave! The usual policy is that all pilots are tested a minimum of once and a maximum of twice annually. The doctor usually just arrives in the crewroom as crews arrive in the morning and asks the pilots whose names are on his list to go with him for their D&A tests. I don't think anybody has ever failed one so far, which only goes to show that there's probably not a problem. It may, of course, show that the fact that where such a policy is in place, people are less likely to transgress
