Picture this, a powerful synthetic opioid that quietly morphs into one of the nation’s most lethal drug crises. A drug that can be slipped undetected into heroin, counterfeit pills...the nation’s bloodstream. You’ve seen and may have even been touched by the devastating impact of fentanyl. And now, a different class of ultrapotent synthetic opioids called nitazenes are following an eerily familiar path. Just how dangerous are these drugs and where are they coming from? Dr. Gregory McDonald, chair of the Department of Forensic Medicine and Pathology at the Philadelphia College of Osteopathic Medicine, joins USA TODAY’s The Excerpt to unpack those questions and more.

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