Abstract: The present invention relates to a forensic system and method, including a methodology, for analyzing medical and pharmacy data to determine the legitimacy of controlled substance prescription and use, and to detect fraud, abuse, and/or diversion of controlled substances. In one aspect, said method provides objective evidentiary data that shows with high certainty whether a suspected medical practitioner has been issuing controlled substance prescriptions “outside the usual course of medical practice” and/or “for other than legitimate medical purposes”. Said method rearranges, organizes, and simplifies the complex data in patients' medical and PDMP charts, and provides a series of three sequential work products in spreadsheet form, a Forensic Chronology chart, a Forensic Summary chart, and a Standard of Care Summary chart, via which medical data is effectively translated into objective criteria from which a legal conclusion can be determined by legal scholars, prosecutors, defense attorneys, and juries.