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Information on Hair Testing

A hair follicle drug test can detect the presence of illegally ingested substances in hair. An analysis of hair fiber will often produce a more accurate drug history than other methods.

  1. Hair testing Versus Urinalysis and Saliva Testing

    • Hair testing differs from other methods in determining historical drug use; based on hair length tested these lab results can detect drug use for periods of up to 90 days prior to testing. Most drugs can't be detected in urine if the urine is tested more than 24 to 72 hours after use, because the body excretes the drugs very quickly. Drugs can no longer be detected in saliva within as little as 48 hours. Hair testing is the preferred method of determining habitual users.

    Types Of Drugs Tested For

    • Marijuana is one of the most commonly consumed drugs in the United States today.

      The federal government currently mandates that employers test employees for cocaine, marijuana, opiates, codeine, morphine, methamphetamine, ecstasy and phencyclidine, also known as PCP, in all methods of available drug testing, as part of federal drug-testing programs, to prevent substance abuse among certain employee groups. However, not all employers have to test for drugs, unless required by the government for particular safety-sensitive jobs.

    Amount Of Hair Required and Type Of Hair Tested

    • A standard test requires 1.5 inches of hair, roughly 60mg of hair or approximately 90 to 120 strands, depending on hair thickness. The tester cuts the hair sample as close to the scalp as possible from several head locations, but it can also be taken from the body.

    Effect Of Hair Treatments And Detox Products On Hair Testing

    • Commonly used hair products and treatments don't affect hair testing results. In significantly damaged hair the drug level can be affected. However, laboratories can easily identify hair treatments and wash ratios. Standard tests observe the molecules deep inside the hair shaft, which makes it impossible for external agents to change the test results.

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