Doubtful they will keep you in diversion.
Most lawyers will give you a free consultation if you ask for one. We do this all the time, but remember that our time is valuable and you should stay with the people who help you the most.
If you fail a UA while on diversion, you will most likely be removed from the program. You will also have to deal with the original criminal charges.
Failing a UA while in diversion is grounds for termination from diversion and re-filing of the original charges. I think you misunderstood the instructor if you felt he or she supported your continued violation of law by smoking marijuana.
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