The prosecution has been calling its witnesses, many of whom are El Chapo's former associates or business partners.

Pedro Flores, a Chicago drug dealer turned informant, says he recorded El Chapo making a drug deal. The tape was played in open court, though the defense tried to cast doubt on the tape's legitimacy.

Another star witness, Jesús Zambada García, an accountant and former leader of the Sinaloa Cartel (and brother of the cartel's current leader) claims he gave millions of dollars to a Mexican president to secure the transportation of drugs through Mexico City. The jury was not permitted to hear this claim, although they did hear other parts of Zambada's testimony, which included mentions of bribing other officials. Mexican President Enrique Peña Nieto, for his part, denies taking any bribes.