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Read what is a hair follicle drug test.

A hair follicle drug test is a technical screening of the hair specimens to determine the presence or absence of drugs and drug metabolites in the system. A hair drug test is considered highly accurate at determining the presence of any prescription drugs or drugs of abuse within a specified detection window of the test. Many abusers attempt to circumvent a hair follicle screening by shaving off their heads. In the absence of the required quantity of the hair on the head, hair on any other part of the body can be used as a substitute. If the subject fails to provide a sample, it may be grounds for many negative consequences. A number of detox shampoos will help you pass a drug test.s

If the toxin levels in the system increases the drug metabolites are encased in the hair shaft. The longer the hair, the longer back in the history of drug use the labs can go. This is the basic principle of working of a hair follicle test. Many labs use only the hair within 2.5-4 cm oh scalp and discard the rest to detect the drugs. The detection period of hair follicle drug test is relatively higher than any other forms of testing and can go to about 90 days depending upon the growth rate of an individual. On an average the human hair grows at the rate of 0.5 inch per month. Hair follicle testing methods are effective for conducting marijuana contact high drug test, cocaine testing and testing form many others drugs of abuse.

In the recent few decades, a hair follicle drug test is been subjected to a number of law suits. There are various different ethnic groups having different type of hair structures that can potentially register a false positive test result. A false positive arises when one tests positive for the use of illicit drugs even if the drug was not used by the subject. People of African origin and pacific islanders are more likely to test positive for marijuana. Dark skinned subjects like those from subcontinent of India could also register a positive in hair drug test because of higher melanin content. It is thus necessary to ensure that the labs are effective and the subjects should always ask for a confirmation test in case of false positives.