Ivonne Valdés Garay

3 weeks ago | cnn.com | Ivonne Valdés Garay |Daniela Patiño |Maija Liisa Ehlinger |Fidel Gutiérrez

Students follow relatives of the 43 missing students of Ayotzinapa Rural Teachers' College and members of collectives of relatives of missing persons during the Ayotzinapa's monthly march to demand justice in Mexico City, Mexico. Raquel Cunha/Reuters/File CNN  —  Over a decade after 43 students from a rural teaching college vanished in southern Mexico, a new arrest has stirred fresh scrutiny and reopened old wounds.