Hair follicle drug testing is one of the most popular drug-testing methods today. It’s non-invasive, and the samples can be taken easily in a plain view unlike urine drug tests. Normally, when drug metabolites (residues) go into your blood, some of
these metabolites are taken to the blood vessels in your scalp and get trapped in your hair follicles. Get more info about hair follicle drug testing faq: http://www.helpmepassadrugtest.com/hair-drug-testing.php