Chemicals used to make fentanyl are streaming into the Port of Vancouver on their way to drug labs run by Mexican cartels on Canadian soil, the head of the U.S. Drug Enforcement Administration told senators in Washington, D.C., on Tuesday.

Chemicals used to make fentanyl are streaming into the Port of Vancouver on their way to drug labs run by Mexican cartels on Canadian soil, the head of the U.S. Drug Enforcement…

In exclusive interview with USA TODAY, Kevin Brosseau says US-Canada effort has alleviated fentanyl crisis but that nitazenes and others pose threat.