Will China's new fentanyl controls make a difference?

China is adding new restrictions on 13 chemicals used to make fentanyl - the synthetic opioid behind most overdose deaths in the United States. Those chemicals flow from China to Mexico, where cartels produce most of the illegal fentanyl that enters the US. But experts say the new rules may have only limited impact. The World's Tibisay Zea reports from Mexico City.

This story originally aired on Dec. 10, 2025.