Hair follicle drug testing is the procedure through which individuals can be tested for drug addiction. Drug history spreading over a period of 90 days can be detected with ease. There are times when even the drug history of the past few years gets detected in the hair follicle drug tests. That is due to the fact that the metabolites of the drug tends to get trapped in the cortex of the hair strands and when such strands are used as sample in the hair drug test, they tend to show the presence of toxins in the body. Utility of Hair Drug Tests

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