What will happen if I fail my upcoming drug test?

Question Details:

I was arrested with possession of ecstasy when I was 16 years old, no prior criminal history, straight A's in school. With the help of a good attorney I was sentenced to 6 months informal probation, 20 hours community service, and 12 hours of drug counseling. I'm 17 now. I've completed all of my conditions and have gotten in no trouble. In 1 week I go in for my last probation meeting. My PO likes me because I never give him trouble. I have not been tested by my PO yet, but was by my drug counselor and passed. I fear I will be tested by my PO. If I fail what are the possible outcomes I am looking at?

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