False-positive results of Drug Tests

Approximately 30-50% of all positive results are false-positives, which means the test found the presence of illicit drugs but none were taken. Laboratory errors account for some of these errors, but false-positives may be attributed to more than 300 counter medications that can affect the test (see table).

If you eat: You could get a possitive result for:
Ibuprofen (pain relief) Marijuana, barbiturates or benzodiazepines
Cold remedies Amphetamine
Hay fever remedies Amphetamine
Nasal decongestants Amphetamine
Diet pills Amphetamine
Sleep aids Barbiturates
DHEA Anabolic steroids
Novocaine (used in dentistry) Cocaine
Dietary supplements containing ephedrine Amphetamine
Poppy seeds * Opiates / morphine
Hemp food products ** Marijuana

* Large amounts of poppy seeds, for example, a pastry filled with poppy seeds, not a poppy seed bagel, need to be consumed to cause a positive test. However, sophisticated testing can discern the seeds of poppy opiates.

** Hemp oil is eaten for its nutritional benefits.

If you mistakenly found positive for drug use, evaluate whether you have taken any substances known to cause false-positive. Also, remember that the liver problems or diabetes can cause a false positive for amphetamines, opiates or cocaine.

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