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There are veins and arteries that lead to the hair folicle. When you drink or do drugs, the substance passes through those veins and arteries and are trapped in the hair. It stays there for up to about three months.

Actually alcohol stays in the hair follice up to 6 months for head hair and up to 1 year for body hair. Google FAEE testing, it has been around since 2007. ETG hair testing goes back 3 months.

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14y ago

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