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Read about hair drug testing facts.

The main reason for conducting a drug test is to ascertain the presence or absence of drug and its metabolites in the system. The drug test can come up in several forms like the urine drug test, hair drug test or saliva drug test. Drug testing can also be used to detect the presence of other substance rather than the drugs. Hair analysis is becoming more and more popular amongst the public agencies for pre employment drug test. State and federal courts also rely on this method as it gives the most accurate result. A drug test can detect the drug use history further than a blood, hair or saliva test can detect. Read more to know about the hair drug testing facts.

Drug testing laboratories need at least 50 strands of hair each of 3 cm from the crown of the head to conduct a hair drug test. The hair drug testing is considered to be very precise in indicating the drug use in the last few months or even years. The basic mechanism is that when a person uses a drug the toxin level in the system increases and they are encased in the hair shaft. Thus the longer the hair the longer the history of drug used can be revealed. On an average the human hair grows at the rate of 0.5 inch per month.

If a person to be tested is bald or has shaved off his hair then hair from the armpits, legs or chest can be used for the purpose of detection. If the person tries to outsmart the authorities by shaving off his head, the test can be still conducted as hair follicles are used for testing instead of hair. It takes approximately ten days to perform a hair drug test and the results are highly accurate and can be completely relied upon.

People think that it is easy to avoid a hair drug testing protocol however this is not so as this is highly accurate test and it is difficult to dodge the test. You need to follow a strict procedure that will give you little surety to clear the test. There are various detox shampoos and conditioners available in market that will help you pass a test. People use tea for passing drug test as it works as a natural diuretic.