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Below is a practical "rule‑of‑thumb" for how long it takes each of the most common substances—cocaine (and its primary
metabolite benzoylecgonine), heroin (and its main metabolites
6‑acetylmorphine, morphine, and codeine)—to be
detectable in the three most widely used drug‑test matrices:

Substance Matrix Typical detection window What it means for a test

Cocaine / Benzoylecgonine (co