Man, I was on probation for 15 months in a hard ass hick county here in TX. I tell you what, the best thing to do while you are on probation is just to stop smoking all together. It isn't worth the possibility of getting caught using, being called up for a random drug test, or even worse getting thrown in jail. I smoked all 15 months while on probation, and looking back on it all, it just made me have restless nights leading up to the test and staying up all night the night before drinking coffee and water just to dilute my piss enough to pass their test. I ended up getting off early though, but the best thing is just to not smoke while on papers.