Every generation has a larger-than-life criminal: Jesse James, Billy the Kid, John Dillinger, Al Capone, John Gotti, Pablo Escobar. But each of these notorious lawbreakers had a white hat in pursuit: Wyatt Earp, Pat Garrett, Eliot Ness, Steve Murphy. For notorious drug lord Joaqu n Archivaldo Guzm n-Loera--El Chapo--that lawman is former Drug Enforcement Administration Special Agent Andrew Hogan. In 2006, fresh out of the D.E.A. Academy,...