Of course, that depends on what part of the hair they get, which they'd have no way of knowing... if it's from the very ends, it could be 2+ years old and probably would test clean... but interesting idea.
Of course, that depends on what part of the hair they get, which they'd have no way of knowing... if it's from the very ends, it could be 2+ years old and probably would test clean... but interesting idea.
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