these other answers are clueless. the average detection period is 90 days in the hair.
How long does the presence of drugs stay in your hair for a hair drug test?
Until you cut your hair, I would guess. Unless you use some harsh chemicals like bleach or something, that might alter the molecular structure of your hair enough to remove the presence of drugs. Probably also depends on the drug being tested for.
How long does the presence of drugs stay in your hair for a hair drug test?
depends on the drug. some stay in the system for years with residual amounts, some dont. no way to tell for sure with the hair though. probably a minimum of 3 or 4 months
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