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Hair test procedure is one of the most common drug testing methods that is being opted by many medical professionals. It is a very reliable source of drug testing. This method of drug testing is mainly applicable in offices, where a candidate has to pass drug test before being hired by the authority. The biggest advantage of hair test procedure is that it can detect exposure to drugs for years. Hair from any part of the body can be used for this test. If a candidate thinks that, he/she can escape the hair test by shaving off hair from the head, he/she is highly mistaken. Medical experts can use body hair for the drug test.

In the hair test procedure, a strand of hair is taken from the body and is sent for laboratory testing. The drugs that are covered by the hair testing procedure are phencyclidine (PCP), marijuana, cocaine, methamphetamine (meth/amphetamine & ecstasy drugs) and opiates (6-monoacteyl morphine, codeine and morphine). A standard hair test will cover a period of 90 days; this implies that if a candidate has consumed the above-mentioned drugs within three months of the test, the results of the test will be positive.

Marijuana system water test is the most commonly performed drug test in this category. Marijuana is a dangerous drug. The TCH metabolites enter the blood and then the blood vessels. Finally, they are filtered through the hair. Marijuana metabolites stay in the hair for a long period and test positive in a drug hair test. The accuracy and authenticity of a hair test is much higher in comparison to a urine drug test or a saliva drug test. It is also difficult to detox hair with a hair follicle detox shampoo.

For a standard hair test procedure, about 60+ milligrams of hair is required, which is equivalent to 90-120 strands of hair. This amount is however dependable on the thickness and quality of the hair of an individual. It has also been scientifically proved that coloring hair will have no impact on the hair test method. There are some advantages of the hair test over urinalysis. The chances of tampering with the hair samples is really less, while urine samples may be diluted or tampered with in a number of ways. Another point is that hair testing provides a wider range of drug detection than urine tests.