I notice that this thread really seems to steer clear of alcohol which I consider to be a much more prevalent problem than any other drug on boats and in society. It is a drug. Unless the topic is avoided because it's legal. If that's the case I can think of several halucinogenics that the laws haven't caught up to yet not to mention prescribed narcotics. Would they be OK? Is the captain mentioned a few posts ago who drinks 1/2 a fifth of Vodka a day acceptable? How about if he does it on shore at night and is only hung over while running his vessel? I know this may strike close to home for many, but let me ask: How many know of captains or crew that operate while impaired. Personally, I haven't found it to be a big problem, but more important than if a stew smoked a joint 3 weeks ago.