Yes, Michelle, J_9 is correct. They don't care about levels. Even if it shows trace amounts, that is considered failing. Nothing is taken into consideration here. Clean means clean. Completely clean. That is all they care about. I know this entire process is hard for you, but they do not give out pats on the back for "almost quitting". This isn't kindergarten in which you get a gold star for trying. These guys are deadly serious about what they do for a living.
Honey, you are too old to be playing these kinds of games with yourself. A couple of us have given you some good ideas on how to deal with the stress in your life. It is time for you to stop looking for the loopholes and do something constructive for yourself. You need to take control of your situation and get yourself past having to deal with a P.O. The only way to do that is to NOT ingest ANY kind of drug. Period.