im not 100% sure but to try and help i would have to speculate and i dont think that would help you, however im 90% sure the closer to the scalp the more recent the use, also 95% sure bleaching your hair ect DOES effect the test not sure how many times u have to bleach/dye it tho.
bman2020 Reviewed by bman2020 on . Hair test question I'm graduating college in may this coming year, and am expecting a hair test. Should I plan on having a pre employment test looking at three month or six month time frame when I am tested? If I for instance only have a inch and a half or so of hair, would they be able to look back more than three months? Thanks! Rating: 5