Theoretically, because of the growth rate of scalp hair, hair analysis can detect drug use over a longer past time period than can urine testing.

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Hair analysis can detect drug use over a longer period because drugs are incorporated into the hair as it grows, allowing for a detection window of up to 90 days or more, depending on the length of the hair, whereas urine testing typically detects drug use within the past few days to a week.

Theoretically, Because of the Growth Rate of Scalp Hair, Hair