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This Oct. 1, 2015 photo shows the number 43 spray painted on a wall of the partially destroyed municipal palace in Iguala, Mexico. The government building was torched by protesters last year in the aftermath of the disappearance of the 43 students on Sept. 26, 2014. A government investigation into the students' disappearance stated that a top commander of Iguala's police managed the Guerreros Unidos drug cartel's police payroll, from the mafia to members of the force. The same commander also oversaw police roadblocks at all of the highway entrances to Iguala--roadblocks that ensured drug loads moved through, that suspected enemies of the cartel were intercepted, and that kidnappers were free to bag their prey. (AP Photo/Dario Lopez-Mills)