Many people do not use this, mostly police officials or doctors use these test to know more about the victim or suspicious party. It is most costly among the entire drug testing using different specimen.
Hair testing is considered accurate and can go back for 90 days. As hair grows out, any drugs used are encased in the hair shaft, so people with longer hair can have test go back 3 months in the individual's drug history. Human hair grows an average of .5 inches/month, which corresponds to 30 days of possible drug testing for every .5 inch.
Testing laboratories generally require .5 inches for testing. This means they can test for around 30 days of drug use. The standard for hair 1.5 inches or longer is 80 strands or 120 if only .5 inches as it is by pictogram weight that the hair is uniformly tested. Some people attempt to circumvent this through shaving their heads. This does not usually work. In the absence of the required amount of hair on the scalp, body hair can be used as an acceptable substitute in the order of face, chest, armpit, and on some occasions, the police use leg hair that has a shorter slower growth rate. If all hair is shaven, the follicles of the hair may be used in place of the hair. Removing the hair follicles is more painful.
Hair testing is considered accurate and can go back for 90 days. As hair grows out, any drugs used are encased in the hair shaft, so people with longer hair can have test go back 3 months in the individual's drug history. Human hair grows an average of .5 inches/month, which corresponds to 30 days of possible drug testing for every .5 inch.
Testing laboratories generally require .5 inches for testing. This means they can test for around 30 days of drug use. The standard for hair 1.5 inches or longer is 80 strands or 120 if only .5 inches as it is by pictogram weight that the hair is uniformly tested. Some people attempt to circumvent this through shaving their heads. This does not usually work. In the absence of the required amount of hair on the scalp, body hair can be used as an acceptable substitute in the order of face, chest, armpit, and on some occasions, the police use leg hair that has a shorter slower growth rate. If all hair is shaven, the follicles of the hair may be used in place of the hair. Removing the hair follicles is more painful.
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