Patricia Manzanares Ochoa shows a picture of her son Juan Hernandez, a police officer who disappeared from a police station in February 2011 in Nuevo Leon, Mexico. In 2011, Hernandez second year in the force, Mr. Hernandez was sent to San Nicolas de los Garza, in Monterrey, an area embroiled in a brutal wave of violence as Los Zetas fought rival cartels for control of the smuggling corridor. Mr. Hernandez was last seen late on Feb. 20 inside the 88 Inn, the hotel where the police were staying.Fernando Morales/The Globe and Mail