Mexico has sent infamous drug lord Rafael Caro Quintero to the United States along with 28 other prisoners requested by the U.S. government.

Mexico is weighing further trade measures to crack down on low-cost shipments into the country, an official said on Thursday, after slapping tariffs on so-called "de minimis" purchases largely coming from China.

The handover of so many significant cartel figures was one of the most important efforts by Mexico in the modern history of the drug war to send traffickers to face charges in U.S. courts.