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Drug tests have standard cut off concentration for detection for each drug and drug test, one reason is to avoid false positive results from second hand smoke, incidental ingestion, etc... for example .. standard THC (major marijuana metabolite) cut off for urine drug test is: most home test kits/ lab initial screen or immunoassay test - 50ng/ml (50 nano grams THC per 1 milliliter urine) and 15ng/ml at the Lab confirmation test usually GC/MS (gas chromatography - mass spectrometry ). Confirmation test is applied to samples that test positive during the initial test .. So concentration of thc above this cut off make test positive for thc.

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13y ago

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