After Year of Suspicious Thinking, U.S.-Mexico Collaboration on Cartel Cases Improves

By Kira Zalan and Colby Adams

In the resort town of Mazatlan, just before dawn on Feb. 22, Mexican Marines stormed a fourth-floor, two-bedroom apartment of Hotel Miramar and captured Joaquin "El Chapo" Guzman, the elusive head of the powerful Sinaloa Cartel. Guzman had been on the run since escaping a high-security prison in 2001, and his arrest seemed nothing short of a big win for Mexican and U.S. law enforcement officials. Nearly two years after the inauguration of Mexican President Enrique Pena Nieto, whose election prompted some American officials to quietly question Mexico's resolve in the fight against drug trafficking cartels, Guzman's arrest can also...