I am currently on probation for two underage drinking violations. My P.O. drug tests me once a month and recently I was looking online at all the drugs/vitamins that cause false positives. Vitamin B2 (which I take) causes a false positive for THC. What happens if I get a false positive will my P.O. violate me? She hates me and I am worried that she would use this as an opportunity to send me to jail. As long as I tell her I take B2 before the test will I be ok? What are my rights as far as false positives?