Can Riboflavin (Vitamin B2) or Naproxen cause a false positive for THC?

I am currently on probation and I was drug tested the other day. All the drug categories were clear….however, my P.O. told me there was a very "faint line for THC" What does that mean exactly? From what I understand there should be two lines for a negative and the test was negative, but the line was very faint. She accused me of using small amounts of marijuana. I don’t use Marijuana!!! What could cause the line to be "very faint"? The previous six tests were all negative. The only changes were using Adderall XR and the anxiety drug Buspirone….I also had a lot of vaginal blood in the urine sample due to spotting from Endometriosis. I have a medical journal source that says Naproxen could cause a false positive for THC……Are their any doctors or people with knowledge regarding this subject out there? I am feeling extremely paranoid and I don’t like being accused of using small amounts of Marijuana. I attend AA…could the faint line come from being near drug users?

http://www.jfponline.com/Pages.asp?AID=4455&UID

That is a source that I found discussing false positives. The doctors include Naproxen on their chart. Could I show my P.O. this? Would she just say it is wrong?


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2 Comments

  1. K
    Posted April 26, 2010 at 11:51 pm | Permalink

    Well, if the other drug users hot box their clothes so you can get contact highs by smelling them, then yes. But if that is true that Naxopren can give a false positive, you must tell the person running your test of the medicines you are taking.

  2. schwartr88
    Posted April 26, 2010 at 11:51 pm | Permalink

    What medical journal said that?

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