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A drug test (also often toxicology screen or tox screen) is a technical analysis of a biological specimen, for example urine, hair, blood, breath, sweat, or oral fluid/saliva—to determine the presence or absence of specified parent drugs or their metabolites.
Large-scale drug screening (or urine, hair and other samples) is usually done using enzyme-linked immunosorbent assays . [10] Positive ELISA findings are followed by confirmatory testing with liquid chromatography–mass spectrometry (LC-MS) or gas chromatography–mass spectrometry (GC-MS). [ 8 ]
Cannabis drug testing describes various drug test methodologies for the use of cannabis in medicine, sport, and law. Cannabis use is highly detectable and can be detected by urinalysis , hair analysis , as well as saliva tests for days or weeks.
Saliva drug testing is a common workplace drug test. Hair Tests. Compared to other CBD drug test options discussed earlier, hair drug screening has the longest detection window, capable of ...
Hair grows at approximately the rate of ½ an inch per month and takes about 5 days to grow out past the external layer of skin. Psychemedics’ standard test uses a 1 ½ inch sample of head hair, which provides an approximate 3 month history of drug use. Body hair can also be collected if head hair is not available. [2]
Testing for drugs in hair is not standard throughout the population. The darker and coarser the hair the more drug that will be found in the hair. If two people consumed the same amount of drugs, the person with the darker and coarser hair will have more drug in their hair than the lighter haired person when tested.
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