Damn 7 times. The government sure isnt very strict on drug users. And they wonder why the world is such a bad place. What if you were never actually caught doing drugs? Would this mean that you could work for them, or do they make you fill out a survey before you start, and if you say Yes to "Have you used drugs more than seven times?" they wont hire you?
Actually they do a polygraph, which if I am right it is illegal for an employer to give you a polygraph test (or maybe thats just a PA state law). But of course the government does it.

I forgot to mention when I was down in DC for a wedding, all the government agencies and armed forces had this huge thing going on at the mall (is it spelled maul or mall?). There were a few agencies including the NSA and DOD that got quite excited when I told them I was a CS major. I left with a handful of brochures they gave me.