Shadow Catcher

Police officers stand next to the body of young Mexican migrant Sergio Adrian Hernández (14), at the US/Mexico border, under the 'Santa Fe International Cross' gate, in Ciudad Juarez, Mexico. (June 7)

One of the most highly decorated officers in the history of the U.S. Immigration and Nationalization Service and the author of Shadow Catcher: A U.S. Agent Infiltrates Mexico's Deadly Crime Cartels, Hipolito Acosta, talks about his work in the "border wars."