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Read about hair folicle drug tests.

Drug testing is basically the examination of biological specimens for the presence or absence of drug metabolites in the system. Drug tests are mandatory and can come up in several forms. A hair drug test is highly accurate at showing the use of drugs of abuse within a specified detection window. A hair follicle drug test can detect the use of drugs several months as well as years ago. Hair drug tests are expensive and not preferred more. They can be used as follow up tests in case if one fails a test to confirm the first test result. Marijuana blood testing is also not preferred much.

Some people attempt to circumvent the hair follicle drug test by shaving off their heads. But this wont help as in the absence of required amount of hair on the scalp, any body hair can be used for the purpose of detection. For pre employment drug testing the inability to provide a hair sample may be grounds for loosing the job opportunity. As the hair grows out drugs are encased in the hair shaft. The longer the hair, the longer back drug use history can be detected. Most of the drug testing labs uses about 3 cm of scalp for the purpose of screening. This arbitrarily limits the detection period to 3 months depending upon the growth rate of hair.

The process of hair follicle drug testing stands on the principle that once the drug is processed by the system completely, traces of the drug are deposited in the hair by the bloodstream. Hair follicle drug test is effective in detecting the use of opiates, Cannabinoids, PCP, amphetamines and cocaine. The mandatory check by the federal government is the hair follicle test as it can be completely relied upon.

Hair follicle drug tests are more accurate and effective than urinalysis. This is because in urinalysis the drug can be traced only when the substance is present in the blood stream. However a hair follicle can trace the substances even long after the substances has left the blood stream. Whatever a person eats, drinks or smokes enter the hair so as to nourish them. This is the reason for the high efficiency of a hair follicle drug test. Stay clean and you can clear a drug test!