I failed a drug test for marijuana but don't smoke. i take about 800mg ibuprofen a day and am on a vitamin b complex daily, which is 50 mg of b2 a day?

False positive test: "In some cases, a drug test may report the presence of illicit drugs, although none were taken. While this is not common, no test is 100% accurate. Lab errors account for some of the mistakes, but most false-positives may be attributed to over-the-counter drugs and foods that can affect the test" - Ibuprofen and hemp food products have been associated with false positive drug tests.