There're a few things that can give a false positive in a drug test for THC. One of them are Ibuprofen. My experience: Somehow I tweeked my back and the doctor gave me a prescription for 800 MG Ibuprofen, I took three pills per day for three days. On the fourth day I took an 800 MG tab of Ibuprofen before reporting to work. A few hours into my work day I was notified that I needed to take a random drug test. I said, I want to see if I can get that false positive so I took one more 800 MG pill. I drove to my works clinic and after an hour or so I was called for the test. I never heard anything from the Medical Review Officer so I guess I never gave that F/P test.

If you gave a F/P, I would have to say you must have ate whatever you were taking for breakfast, lunch and dinner for several weeks. Probation Officers and Judges hear about F/P all the time and don't believe any of them. Good Luck.

Your county PO will notify your Federal PO, hopefully after you do?