AdvertisementTurf Fight Is New Front In Mexico's Drug WarMarch 15, 2010John BurnettfacebookEmailPolice unload packages of marijuana confiscated in January in Nuevo Laredo, Mexico. The U.S. Drug Enforcement Administration estimates half of all Mexican marijuana is smuggled into the U.S. through South Texas. Two drug cartels are now fighting for control of the area. (AFP/Getty Images)