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Hair follicle drug test methods have become very popular in USA and the rest of the world. It is one of the safest and most reliable drug tests, which are carried out. The U.S. Food and Drug Administration have approved hair follicle drug testing. Many companies and organizations are opting for this test as a pre-employment drug screening procedure. Again, in some organizations, candidates require passing a drug test for probation period. Though hair follicle drug test is expensive than urine drug tests or saliva drug tests, it is accurate and tamper-free.

For carrying out a hair follicle drug test, the primary requirements are few strands of hair. It is not necessary that the hair have to be from the head scalp. It can be from any part of the body. However, a minimum of Ѕ to 1 inch hair is required for the test. The quantity of hair required also depends on the quality of the hair of an individual. The sample of hair is submitted in the laboratory, which is further sent for detailed investigations.

Different types of chemicals are applied to the hair strands to test for the drug metabolites. Hair follicle drug test methods are capable of detecting five types of drugs, namely cocaine, amphetamines, marijuana, phencyclidine and opiates. On special request, other toxic substances like poisons, heavy metals as well as alcohol can be detected via hair follicle drug test methods. If a candidate is into long-term drug usage, he/she will surely test positive in the hair follicle drug test, which might not be possible in a urine drug test or a saliva drug test. This test can detect drug usage within 3 months from the day of testing.

If a candidate is a regular drug user, it is almost impossible for him/her to pass the drug test. Using detoxifying agents like hair follicle detox shampoos will also not help. The shampoo will only remove the toxins from the upper shaft of the hair. Moreover, in this test, the internal shaft of the hair is analyzed. Opportunities of tampering with the strands of hair are also minimal. The number of drugs that can be detected by the hair follicle test is far more than the drugs detected in a urine drug test or a saliva drug test. Last, but not the least, this drug test uses a confirmation process that is inclusive of gas chromatography/mass spectrometry so that the accuracy of the test is verified.