For years, China has been a primary source of fentanyl trafficked into the United States.

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https://www.npr.org/2020/11/17/91689088 ... -drug-user

But more than a year later, Chinese vendors have tapped into online networks to brazenly market fentanyl analogs and the precursor chemicals used to make fentanyl, and ship them directly to customers in the U.S. and Europe as well as to Mexican cartels, according to an NPR investigation and research from the Center for Advanced Defense Studies, or C4ADS, a nonprofit data analysis group.