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Krotulski, Alex and Papsun, Donna and Mata, Dani and Ellefsen, Kayla and Shoff, Elisa and Shanks, Kevin and Sofalvi, Szabolcs and Kacinko, Sherri and Lewallen, Wayne and Vikingsson, Svante and Logan, Barry (2021) Recommended scope for NPS testing in the United States. Based on trends observed in Q1 2021. Arizona: Society of Forensic Toxicologists.