Does anyone know how the hair test works? I am having to take one next week and wasn't sure how long they usually go back. It's just a factory job. I am also kind of worried because when I had my motorcycle wreck I was on alot of stuff (legally). And I might have taken 2 draws off a jiont within the last 2 months. But it was prolly the on time I have done it for years. How will it turn out?