Research & Education JFS Articles AAFS Connect Conference Proceedings Reference Series Library International Educational Outreach Program Data-Supported Poly-Drug Use Among Fentanyl Users: A Toxicology Perspective Presenting section: Toxicology 2020 Krotulski, Alex J., Willow Grove PA; Varnum, Susan, Philadelphia PA; Logan, Barry K., Horsham PA View the paper Toxicology