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It is also used by employers, who test their employees. Hair analysis has the virtue of showing a 'history' of drug use due to hair's slow growth. Urine analysis might detect drugs taken in the past 2–3 days; hair analysis can sometimes detect use as far as 90 days, although certain cosmetic treatments (e.g. dyeing hair) can interfere with this.
Hair drug testing is a method that can detect drug use over a much longer period of time than saliva, sweat or urine tests. Hair testing is also more robust with respect to tampering. Thus, hair sampling is preferred by the US military [66] and by many large corporations, which are subject to Drug-Free Workplace Act of 1988.
Cannabis use is detectable with hair tests and is generally included in the standard hair test. Hair tests generally take the most recent 1.5 inches of growth and use those for testing. That provides a detection period of approximately 90 days. [5] If an individual's hair is shorter than 1.5 inches, this detection period will be shorter.
Chemicals in the bloodstream may be transferred to the growing hair and stored in the follicle, providing a rough timeline of drug intake events. Head hair grows at rate of approximately 1 to 1.5 cm a month, and so cross sections from different sections of the follicle can give estimates as to when a substance was ingested.
The results of these clinical trials: After using finasteride for 10 years, 99.1 percent of the men displayed a prevention of hair loss progression, with 91.5 percent also showing improvements in ...
In mainstream scientific usage, hair analysis is the chemical analysis of a hair sample. The use of hair analysis in alternative medicine as a method of investigation to assist alternative diagnosis is controversial [1] [2] and its use in this manner has been opposed repeatedly by the AMA because of its unproven status and its potential for healthcare fraud.
A single black hair could help bring clarity to the mysterious death of a 50-year-old Philadelphia woman who choked on a large disinfectant wipe at a care home for people with development ...
J.B. Hunt added hair testing for drugs to all pre-employment tests since May 2006, in addition to Federal Motor Carrier Safety Administration (FMCSA) mandated urine testing. [16] Hair testing can detect prior drug usage for up to 90 days. [17] Drivers are also trained and certified in the safety training program Smith System. [18] [19]
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