How accurate is the testing of hair follicles?

Hair follicle testing is reportedly extremely accurate to detect lower levels of drug use and drug use for a longer period of time. For example, there are some drugs that may be difficult to detect in a person's urine once several days have passed. However, drug testing on hair follicles can detect drug use that has occurred for weeks or even months before the person was tested. Drug detection times may depend on the type of drug used, the frequency with which it was used and the metabolism of the person that is tested. However, hair follicle testing is usually accurate after much longer than a drug or urine test.

It is often considered to test hair follicles as an optimal selection test because it is highly accurate and provides prolonged detection times of drug use. While the time of drug detection varies, urine and blood detection time is often only days. For example, the use of marijuana can be detectable in the urine for only about 63 days for a person who used it daily. Hair folliclesHowever, it can bring accurate results for up to three to six months. In most cases, however, the 90 -day detection time is considered to test hair follicles.

It is the length of a human hair sample that limits how far the follicle test can detect the use of drugs. 90 -day detection is considered normal because drug use can be detected back so far even if the hair is short. For example, a few 1.5 inches (about 3.81 centimeters) of hair are detected to detect a wide range of drugs. However, if the hair is much longer available for testing, the drug test can detect accurate results for a much longer period of time. For example, this could reveal the use of drugs that occurred several months before testing.

One of the reasons why drug follicle testing is considered so accurate that it would be very difficult to detoxify his hair and deceived his follicle. There are some companies whoThey sell special shampoos, teas and other products that they claim to be useful for the defeat of hair follicles. However, these products usually do not work. It is unlikely that even cutting off all hair on someone's head could not work to block drug detection. Hair for drug testing can be taken from other parts of the body; However, they are usually not used for drug testing.