U.S. Agencies Infiltrating Drug Cartels Across Mexico

http://www.nytimes.com/2011/10/25/world/americas/united-states-infiltrating-criminal-groups-across-mexico.html?_r=1&hp

American law enforcement agencies have significantly built up networks of Mexican informants that have allowed them to secretly infiltrate some of that country’s most powerful and dangerous criminal organizations, according to security officials on both sides of the border.