According to Elizabeth Hartney, PhD., "Although the medical use of fentanyl has declined recently, illicit fentanyl and its analogs and derivatives have become a significant part of the larger opioid crisis which has spread across the United States and Canada, as well as many other countries. The fentanyl crisis is claiming the lives of hundreds of people each month."

This article discusses the spread of medical and illicitly made fentanyl throughout the illicit drug market, increasing the rate of drug-related deaths. 

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