MEXICO CITY (AP) — As Mexican marines closed in on infamous drug lord Rafael Caro Quintero deep in the mountains of his native state of Sinaloa, it was a 6-year-old bloodhound named “Max” who rousted from the undergrowth the man allegedly responsible for the murder of a U.S. DEA agent more than three decades ago.While the United States’ motivation to find Caro Quintero was never in doubt — hence the $20 million reward for information leading to his capture — there was less certainty about the commitment of Mexican President Andrés Manuel López Obrador, who had made clear his disinterestYet on Friday, three days after López Obrador and U.S. President Joe Biden met in the White House, the most wanted target of the U.S. Drug Enforcement Administration was in Mexican custody.

Mexico’s Attorney General’s Office said in a statement late Friday that Caro Quintero was arrested for extradition to the U.S. and he would be held at the maximum security Altiplano prison about 50 miles west of Mexico City.

“It seems to me that in the private talks between President Joe Biden and Andrés Manuel (López Obrador) they surely agreed to turning over high-profile drug traffickers again, which had been suspended,” said security analyst David Saucedo.

Cooperation between the DEA and Mexico’s marines had led to some of the highest-profile captures during previous administrations, but not under López Obrador, Saucedo noted.