The hair follicle drug test is part of a growing range of test procedures that companies and law enforcement agencies can call upon.
There was a time when testers barely used it and turned to other means for the quick and reliable result. This all changed in recent years as researchers insisted that a hair drug test was the best possible way to detect long-term drug use. They would highlight the long detection window, the strong source of metabolites and foolproof procedure as reasons to turn to this method. Many believed this to be true, and users would turn to extreme methods of cleansing and detoxing in response.