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A procedure based on gas chromatography–mass spectrometry (GC–MS) is described for determination of opiates (6-monoacetylmorphine, morphine and codeine) and cocaine and metabolites (cocaine, benzoylecgonine and cocaethylene) in human teeth. After addition of nalorphine as internal standard, pulverized samples were incubated in HCl at 37°C for 18h. Then, after pH adjustment to 6, and the analytes were...