yes, I said very, very low chance as there is not enough used for a build up (which I was referring to the hair) urine test as you know are 100% fine. But I with hair (depending upon what type of test they do) can go back for months or years, but this will generally give a reading for those that are chronic users. If it's been about 8 times total in a 6 month period, you are not a chronic user. Plus the reason for chronic users, there are prescribed medications that can give a false reading, so it really goes back to how much you have used and 8 times is not a lot at all. (of course since I am in the medical profession, 8 is too many) but in general, not a lot. I can't say 100% free, but very low Hun.