For Hair Drug Testing we have a term and definition in Drug Testing.

Hair testing can detect all substance activity in-depth over a long period of time. Whenever a substance enters your bloodstream, either through ingestion, inhalation, or injection, it deposits a residue in the hair shaft that remains until the hair is cut. Kind of like rings on a tree, whatever substance history you have is recorded in your hair. The longer your hair, the more history they have to use against you. Fortunately, our line of cleansing shampoos and other hair products can permanently cleanse all traces of activity from your hair. So you get two Pass Your Test and keep your hair!
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