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Read about hair follicle marijuana drug test information.

Hair follicle drug tests are gaining popularity these days because of the sheer accuracy they provide and the history of use that can be detected. Drug tests for hair follicles are almost impossible to tamper with. A hair drug test checks for the use of several illegal drugs like cannabis, methamphetamines, cocaine, PCP and opiates. Drugs like marijuana and heroin in drug test hair can be easily detected as they are likely to stay in the system for longer durations of time. Although, the hair drug tests are more expensive than a urine drug test their results are more conclusive. Moreover, hair drug test can trace the use of drug that took place over the previous 3 months or even further. A hair drug test is performed in lab setting.

The drug testing for hair requires 90 strands of hair each about the thickness of a shoelace, that is cut as close to the scalp as possible. Generally, the most recently grown inch and a half of hair will be tested. Many people try to avoid a hair drug testing protocol by shaving off their heads, however this won’t work. In the absence of sufficient amount of hair on the head, the authorities yield the sample from hair present on any other body part. Though, the body hair grows at a slower rate than the hair on the head, they can be used to detect the presence of marijuana. Because of the slow growth rate, the use of drugs can be traced over the previous year prior to the test.

Hair drug tests are considered to be the most accurate testing methods for the use of illegal substances. It is almost impossible to tamper the hair samples, thus strengthening the reliability of the method. Hair drug test is the only method that can detect the use of drugs like marijuana over the extended period of time. Many people try to beat a hair follicle drug test with the aid of detox shampoos. But the only assured method to pass a drug test is to abstain totally from marijuana!