The captures and extraditions of Sinaloa Cartel co-founder Ismael "El Mayo" Zambada and Joaquín Guzmán López, son of "El Chapo" Guzmán in late July were hailed as major strikes against fentanyl trafficking in the U.S. However, the captures led to more violence, sparking an all-out war in northern Mexico as two ensuing factions fight for control.
