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. 2021 May 5;66(4):1186–1200. doi: 10.1111/1556-4029.14712

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© 2021 The Authors. Journal of Forensic Sciences published by Wiley Periodicals LLC on behalf of American Academy of Forensic Sciences

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Number of unique fentanyl‐related compounds in NFLIS‐Drug in 2009‐2019, documenting the beginnings of the decline in FRS by number of different substances after temporary class‐wide scheduling (Tracking Fentanyl and Fentanyl‐Related Compounds Reported in NFLIS‐Drug, by State: 2018‐2019. Dec 2020. NFLIS, DEA. https://www.nflis.deadiversion.usdoj.gov/DesktopModules/ReportDownloads/Reports/NFLISDrugSpecialRelease‐Fentanyl‐FentanylSubstancesStateMaps‐2018‐2019.pdf (accessed February 2, 2021))