However I know people who passed hair follicle tests by having their hair bleached...apparently it strips the hair and follicle. IDK. My friend's dad would bleach his hair then dye it back to his natural cover over that...guess that's why all his hair fell out! ha
From what I was told the last time I had one, the test can date back up to 4 months. Well this was 2 years ago so it might have gotten better since then... lol. But as for the bleaching, it does work sometimes, but you have to go get the test done within a certain time frame.
Re: Drug test question
I was thinking it went back further than this
I thought the hair samples went back 6 months, depending on length of hair.
You will need to ask a real lawyer or a lab tech.