The authors wish to acknowledge the following individuals and organizations whose efforts contributed to the success of this project:Diana Schell,Oakland County Medical Examiner Forensic Pathologists,NMS Laboratories,and Michigan State University Department of Epidemiology’s T‑32 Lab.
Carfentanil,an ultrapotent analog of fentanyl,has invaded the street drug market,unbeknownst to many heroin users.About 10,000 times more potent than morphine,it was initially suspected that 20μg of the substance was...