A case investigated by the Office of the Chief Medical Examiner, State of Maryland, identified methadone at a heart blood concentration of 2.4 mg/L and a subclavian blood concentration of 0.8 mg/L. Due to these discrepant results, a study was undertaken to determine whether such inconsistencies occurred in other methadone cases. Of the 15 cases studied, only four had heart blood and alternate blood concentrations within 20% of one another. In only 53% of the cases were variations of < 60% observed. The data failed to show a trend where one site was consistently higher or lower than the other site.