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© 2020 The Author(s).Illicit fentanyl occurrence in Los Angeles, California has increased along with the emergence of several fentanyl analogues (fentalogs). The following two case studies address the original identification of cyclopropyl fentanyl in cases investigated by the Los Angeles County Department of Medical Examiner-Coroner in the summer of 2017. In the first case study, cyclopropyl fentanyl was the only drug detected in the decedent's system and was also identified in medical evidence collected at the death scene. Medical evidenc