Hair drug testing is more reliable than other methods as it can detect historical drug use for up to years. Traces of drugs remain in hair follicles, allowing for a wider range of drugs to be detected. The test requires multiple strands of hair, and is difficult to cheat.
Hair drug testing is a drug detection method that is more reliable and better able to detect historical drug use than urine, saliva, and blood samples. Drug tests that take samples of bodily fluids are really only able to detect drugs that are still present in the system due to recent use. Hair follicles, on the other hand, tend to retain traces of drugs for long periods of time, up to years depending on the length of the sample. This allows for a history of drug use to be detected even when the drugs are not present in the system. Another plus is that the test isn’t limited to scalp hair; it can detect drugs in any follicle in the body. Hair drug tests can detect a wide range of drugs, including cocaine, opiates and narcotics.
The hair drug test works so well because of the traces of drugs that the bloodstream deposits in the hair follicles. As the hair grows, traces of the drug remain present in the strand. The only way to completely ensure that a trace of the drug is removed from a strand of hair is to remove the strand itself completely. The shorter follicle is capable of measuring a period of about 90 days, meaning a person could have stopped using drugs three months before a test and still come back positive for a history of drug use. The longer the hair samples, the longer the period of drug history that can be measured. Some lengths of hair can take years to grow, making it possible in some cases to detect drug use over a period of years.
A hair drug test typically requires multiple strands of hair for the most accurate results. The standard test measures at least 50 strands of hair. The best samples come from the scalp, where hair stays rooted for longer periods of time. If strands are absent from the head, even body hair samples are capable of returning relatively accurate test results.
The hair drug test is one of the best drug screening tests for employers, due to its difficulty of handling and ability to detect a history of drugs even when none are present in the system. Considering that there are methods to rid the system of drugs in order to greatly increase the chances of passing a blood, saliva or urine test, it is much more difficult to rid the hair strands of any trace of the drug. The simplest way to avoid drug detection when facing a hair drug test would be to completely shave off all body hair. This is, however, not a lost technique for most employers, who have reasonable grounds not to hire prospective employees without hair samples.
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