Not a great comparison I know, but nevertheless, there's something to think about.
Perhaps the crime is that of drug trafficking rather than drug usage?
Another question is how the authorities decide who to check. If it is completely random, I guess it must be a rare thing to be caught since I don't imagine there's that many people getting stoned in Seattle while on holiday or visiting family or doing business.
Anyway, this topic was prompted by this article in 7 days this morning. Lets see how this case pans out...
7 Days Thursday, 17th August, 2006
Cocaine case
An airline steward yesterday denied taking cocaine in the UAE, saying that he had taken the drug in France 25 days before he was arrested. The trial was adjourned until September 11.