President Claudia Sheinbaum of Mexico also said Donald Trump was ill-informed when he said Mexico was “essentially run by the cartels.”

Tens of thousands of people have vanished in northern Mexico, many because of cartel violence. An unlikely partnership offers families a form of closure.

New York Times reporters witnessed the dangerous fentanyl production process inside a secret lab in Culiacán run by Mexico’s most powerful criminal syndicate.

A global crackdown on fentanyl has led cartels to innovate production methods and test their risky formulas on people, as well as rabbits and chickens.