what happens if they determine that your hair (head) is too short?
What factors determine how far back hair follicle testing can detect drug use?
They will not be concerned with the length of your hair unless you have obviously shaved it , thinking it would mar the test in some way. As far as determining how far back they can go, depends on if you where a chronic user or not. By the way, they are not testing your hair, it is your hair folicle only.
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