Tomlinsk, I will echo other posters comments, that being honest about who you are makes a huge difference in the replies you receive. I believe drug testing is a must for deploying troops. Follow up testing while in-country should also be conducted. Testing everyone in the Forces is a very expensive venture, the Lab analysis are probably very costly.
I can tell you that I am an ex-soldier, and when I was a Private in 1983, I got caught smoking a joint of weed. I spent 30 days in jail, received 6 months counseling and probation, and waited six months longer than all my buddies to get promoted to Corporal, not to mention the respect that took me years to earn back. It definitely opened my eyes. It was not worth it.
Gnplummer421