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A false positive for marijuana can be caused by the following substances:ibuprofen; (Advil, Nuprin, Motrin, Excedrin IB etc)Naproxen (Aleve)Ketoprofen (Orudis KT)Promethazine (Phenergan, Promethegan)Pantoprazole (Protonix)Riboflavin (B2, Hempseed Oil)Kidney infection (Kidney disease, Diabetes) Liver DiseaseDronabinol (Marinol)as well as large amounts of hemp products.

As for legal recourse, you can ask to take the test again, and avoid those substances, if that isn't permitted, you should talk to a lawyer about your options, unless someone has another resource? erowid.org/psychoactives/testing/testing.shtml is a good place to start looking to find an alternative.

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Q: Can a false positive happen on a marijuana tests and how can it be rectified or retested when the person did absolutely NO illegal drugs?
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