Yes, large amount of Motrin can cause a false Positive with a (Immunoassay)dip "screen" at 50 mg/mL, I failed after taking 1600 mg. It was sent to a lab where the GC/MS showed negative. so it's a yes/no question.
dfguy Reviewed by dfguy on . What should I do???? I was fired from a new job, after a week of working due to a positive drug test. My results were 50 ng/ml in the initial test and 15 ng/ml on the GC/MS confirm test. The company has said I can file an appeal. I have to do this in writing. My question is what otc medications can cause false positives for marjuaina? I took another test the day I was fired (at my OWN expense) and the results were negative. This was approx 7 days after the first test. I've been told that a medical review Rating: 5