Hair drug testing is one of the effective methods in drug testing. Hair is the long time proof for drug addiction because certain drug metabolites get build up in the hair shafts. Drug metabolites are considered as one of the nutrient for hair growth and remains even after 90 days from drug addiction. Elimination of drug from hair is a tough task as it is bonded to the hair shaft. Even if you shave the hair trace amount of drug metabolites will reside in the shafts. (more…)