Hair testing involves cutting a small amount of hair (approx. 100 hairs) and sending off the hair for lab testing.  The hair must be cut at the base of the scalp to get the best results. Hair drug testing is used to determine what drugs are in their body for up to 90 days.  This shows a good history of the client and whether someone has been “clean” or drug free over a period of 90 days.  With hair drug testing, it is hard to cheat because it’s not possible to alter the hair.  Some people think they can bleach the hair to cheat on a drug test, but this is not true. If the client shaves their hair to avoid a hair drug test, then we can cut hair from the underarm, chest, arms or legs.