A Hair follicle drug test can be used to look for any substance both legal and ill-legal including both drugs and chemicals. How far back would be depending on the length of hair and type of testing used. Most peoples hair grows about 1/2 inch to an inch a month and when they take the sample they measure and estimate from the length when someone has been exposed to the substance. Hope this helped.
How far back and for what drugs do hair follicle test look for?
all illegal drugs, and it depends on how long your hair is
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