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A hair follicle drug test requires a 1.5-inch sample of hair cut close to the scalp (about 90 to 120 strands, or roughly the thickness of a pencil) to screen for drug use over a 90-day window.
A hair follicle drug test requires a 1.5-inch sample of hair cut close to the scalp (about 90 to 120 strands, or roughly the thickness of a pencil) to screen for drug use over a 90-day window.