Hair growth is fed by the bloodstream, the ingestion of drugs of abuse is revealed by analyzing a small sample of hair. The testing method measures the drug molecule embedded inside the hair shaft, eliminating external contamination as a source of a positive or adulterated test result.
A standard drug screen covers a period of approximately 90 days. It takes only 4-5 days for the affected hair to grow far enough above the scalp for detection. The hair sample is cut as close to the scalp as possible and only the most recent 1.5 inches are tested.
Body hair may be used for drug detection but due to the slower rate of growth. Most body hair is replaced within one year, that means a test done on body hair will report drug usage with in time-frame.
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