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"They say it's fentanyl, but they honestly look like Perc 30s": Initiation and use of counterfeit fentanyl pills. 

Daniulaityte R, Sweeney K, Ki S, Doebbeling BN, Mendoza N. 

Harm Reduct J. 2022 May 25;19(1):52. doi: 10.1186/s12954-022-00634-4. PMID: 35614447; PMCID: PMC9131678.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9131678/