do you have a paper trail of the marijuana usage? If not, I heard from a guy who heard from a guy who overheard a phone call that said you don't need to disclose.....I was reading somewhere, I think a DOD handbook saying that if it falls under "experimental" usage it was ok as long as it was over 6 months. Their definition was anything less than 6 occurrences I believe which I would fall under.
It would suck to lose out on this job for something I didnt particularly care to do in the first place, but I suppose thats the cost of being dumb.