Synthetic Opioids: Considerations for the Class-Wide Scheduling of Fentanyl-Related Substances, Report to Congressional Addressees [open pdf - 3MB]
From the Highlights: "Fentanyl-related substances are powerful synthetic opioids that can be significantly more potent than morphine. The number of deaths from fentanyl-related substances is unknown, but the Centers for Disease Control and Prevention reports that there were more than 50,000 deaths involving all synthetic opioids in the 12- month period ending July 2020. The Temporary Reauthorization and Study of the Emergency Scheduling of Fentanyl Analogues Act included a provision for GAO [Government Accountability Office] to study the classification of fentanyl-related substances and considerations for future scheduling. GAO focused on effects related to drug classification, research, and federal law enforcement, and effects from the classification of similar substances in China."
Government Accountability Office: https://www.gao.gov/