How far does the testing for a hair follicle and nail drug test go back? i am getting conflicting answers on both tests. i have been told 90-120 days or longer for hair follicle depending on length of hair and up to 1 1/2-2 1/2 years for nail testing.

You : You may be getting conflicting answers because how far back the testing goes depends on how fast your hair and nails grow. When hair is tested, they usually test the 1.5 inches closest to the scalp. If your hair grows quickly, this could be 90 days, if your hair grows slowly, it could be 120. If you have long hair, they could test the whole strand and see any drug use for the past few years, but this is not typically done. It is expensive and wouldn't be very fair to long-haired folks, right? The same goes for the fingernail clippings however, those tend to be 3-6 months, not the 1 1/2 to 2 1/2 years you mentioned.

Varies: The hair testing numbers are about right, with hair growing about 1/2 inch per month, and the average length of hair tested being 1 1/2 inches, which is about 90 days. Nails give 4-6 months at usual lengths. If you never cut them, or have very very long nails, you could get 1-2 years, but that is not common.