Drug checking programs in the United States and internationally : environmental scan summary Pu, Jia, author. Ajisope, Tosin, author. Earlywine, Joel, author. Fentanyl Government Programs Illicit Drugs -- analysis Internationality Harm Reduction This report presents a review and synthesis of approaches and strategies adopted by drug checking programs and existing evidence on their effectiveness in changing drug use attitudes, behavior, and health outcomes. Our review includes studies of drug checking programs across a variety of settings in the United States and internationally. We prioritize studies of drug checking programs that are specific to fentanyl, are coupled with other harm reduction services, and include early evaluation of program effectiveness. At the end of the document, we discuss the implications of the existing evidence for future initiatives and further research on drug checking programs. Oakland, CA : Mathematica, September 17, 2021 Mathematica, Inc., issuing body. Technical Report Text 1 online resource (1 PDF file (iii, 14 pages)) nlm:nlmuid-9918367882106676-pdf 9918367882106676 http://resource.nlm.nih.gov/9918367882106676 English United States Reproduced with permission of the copyright holder. Further use of the material is subject to CC BY-NC-ND license. https://creativecommons.org/licenses/by-nc-nd/3.0