text: Ok here's one option;\n\nTHC - Substances or Conditions which can cause false positives\nDronabinol (Marinol)\nIbuprofen; (Advil, Nuprin, Motrin, Excedrin IB etc)\nKetoprofen (Orudis KT)\nKidney infection (Kidney disease, diabetes) Liver Disease\nNaproxen (Aleve)\nPromethazine (Phenergan, Promethegan)\nRiboflavin (B2, Hempseed Oil)\n\nHere's another option;\n\nSustiva is the HIV drug that has been most linked to false + urine tests for marijuana (Sustiva also know as efavirenz=Stocrine is some parts of the world). KH\n\nHere's another;\n\nI worked in the field of mental health for 25+ years, and\ndrug testing was a common reality. One of the facts which\nshould be well-known to anyone in the field is that THC \ngets stored in the fat cells, so if one is at all overweight\nit's likely that they have THC stored. If the person then\nexercises during the week of testing, it can result in the\nrelease of sufficient THC metabolites into the bloodstream\nto yield a positive test, since the test looks for metabolites,\nand not THC itself. So you won't get stoned when the metabolites\nare released into your bloodstream when you exercise, but the\ntest will still detect them. It can take several years for these\nmetabolites to be released and excreted from the body, so false\npositives in former cannabis users are not uncommon, and this \nshould be taken into consideration by test reporting agencies.\n\nEven normal activities of daily life and the concurrent level\nof metabolism can and will release THC metabolites into the\nbloodstream, and can produce a false positive.\n\nThese are the best I could find. I did a Yahoo Search for "THC False-Positive Urine Test".  You might want to continue searching Yahoo and Google for the Answer. I've sited my sources below. (Btw, if I were you, I would talk to a doctor and have a physical done just to be sure everythings ok, as stated above, it could be a sign of other serious conditions)\n\nSorry and Good Luck!