Most Wanted Mexican Drugs Lord, Rafael Caro Quintero, Arrested
Mr Quintero, who is accused of kidnapping, torturing and murdering a US drug enforcement agent in 1985, was held in the town of Choix.
The Navy said Mr Quintero, believed to be 69, was found in bushes by a specially-trained dog called Max.
The US said it would seek Mr Quintero’s immediate extradition.
“There is no hiding place for anyone who kidnaps, tortures, and murders American law enforcement. We are deeply grateful to Mexican authorities for their capture and arrest of Rafael Caro Quintero,” US Attorney General Merrick Garland said.
Meanwhile, White House senior Latin America adviser Juan Gonzalez wrote in a Twitter post: “This is huge.”
Mr Quintero was one of three founding members of the powerful Guadalajara Cartel, BBC writes.