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just had a drug abuse course taught by someone that actually works in the testing lab and i guess hair tests they can go back 90 days and chk your use of whatever u did in that time period. hair tests are not done as ofter as urine tests though.

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13y ago
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10y ago

It can stay in your hairs for years together.

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9y ago

Methadone can stay in your hair and be detected for up to 90 days. In the urine it is 6 to 12 days, in the blood 24 hours and in saliva 1 to 10 days.

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8y ago

90 days &/or longer. Hair drug test labs can go back longer than that.

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Wiki User

11y ago

forever

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Q: How long does meth stay in your hair?
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