Let's say you last smoked over a week ago and you know you might have a hair test in 4-6 weeks. So basically you are screwed as you will be within the standard 90 days test window.
Supposedly the thc metabolites bond to the hair follicle via the blood. And it takes 5-10 days (depending on the person) for the portion of the hair with the metabolites to break the surface of the skin.
So conceivably, if you shaved your entire body 10 days after your last puff -- the hair that would grows back over the next 4-6 week times would be clean when they finally test it? So you might show up with short hair, but you would not look suspiciously shaved.
Is this correct as far as timeline? I am thinking a full shave and at least a months growth (half inch) may be the only way to beat the hair tests 90 day window.
I can't see how it would not work: you've wiped away the affected hair and given yourself at least a months growth of new, clean hair to be tested.