Hahah yeah it was pretty amusing. I filled the sheet out in about 2 minutes walked up to the Recruiting Officer and handed it to him, he looked it over grimaced at me and said " this is it? Are you sure? You should not be lying on this" It took some strenuous convincing. Even then he said that " I should expect to be randomly tested for drugs" haha 
hahaha, I couldn't remember the date I last did Marijuana, so I put a random date down (I know winter of 2009 was the last time, but they demanded I put a month), but then at the interview he asked me the last time I did Marijuana and had the crap in front of him. That was a bit of a pickle.
It was 3 months after I filled it out so I didn't really remember what I originally wrote, but I guessed January 2009 and he seemed fine with it. Although he did tell me I'd do a piss test during my medical, but I never did. I was a bit disappointed because I kind of wanted to prove to him I wasn't BSing haha. Oh well, they hired me either way.