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It depends, bu5 im pretty sure they use between a half inch and an inch and a half (cant remember the length, but it's either 1/2 inch, 1 inch, or 1 1/2 inches) and it's detectable for up to 90 days.
I'm not sure if they'd use more than the recomended length of hair to test back further or not.... shave your head?
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I raise my hand I got another question, If I start a riot, will I get protection? Cause i'm a kid whos got a lotta problems, If i throw a brick, maybe the brick will go and solve them. Oh, yeah, i wanna riot! Oh, yeah, i wanna riot!
| - Rancid - "I wanna Riot"
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