"El Mayo" Zambada, a well-known leader of Mexican drug trafficking, has been confirmed by the Attorney General's Office as a reliable source. This is because Zambada had claimed that the former rector of the Autonomous University of Sinaloa, Héctor Melesio Cuén, was killed at the farm where he was kidnapped, not at a gas station, as the Sinaloa Attorney General's Office had initially reported. This confirmation could have significant consequences for the governor of Sinaloa, Rubén Rocha Moya, who has denied having been present at the meeting where Cuén was killed, and for the Morena political party. Zambada's letter could also reveal details about agreements between authorities and drug traffickers in Sinaloa.