Do a google search with various terms like drug test, false positives, poppy seeds. I have quoted a section from various articles from a guick google search. Also I vaguely remember a section in the fmscr about poppy seeds.
It can be an eye opener as to which common items such as Ibuprofen can result in a false positive.
My understanding from the reading is that it is the quantity of the OTC taken that can result in issues. For example a couple of Ibuprofen is not a problem but 6-10 in a 24 hour period may be for some people.
My wife works in a hospital lab and just out of curiosity made a loaf of poppy seed bread in our bread machine (really good bread by the way). All three of the ladies in the lab had some and then tested themselves about 8 hours later with the basic drug screen. All tested positive for opiates.
quotes from the web
Ibuprofen
Ibuprofen is a common pain reliever and anti-inflammatory which even in low doses used to cause a false positive for marijuana/cannabis on the EMIT test. The EMIT has been changed to use a different enzyme to eliminate these drug test false positives. But recent evidence suggests that Ibuprofen taken in very high doses, along with other anti-inflammatories such as Naproxen will still interfere with the EMIT test.
Decongestants and Cold Remedies
Phenylpropanolamine and ephedrine are both substances found in many over-the-counter cold remedies. They can result in a drug test false positive for amphetamines on the EMIT test. Antitussives, to suppress coughs, such as dextromethorphan and perylamine may cause a drug test false positive for opiates.
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