U.S. National Intelligence Director James Clapper told lawmakers here that drug-related violence in Mexico poses a security threat to the United States and acknowledged that the system in place to prevent a potential terrorist from penetrating the U.S. southwestern border is not "iron-clad." During an appearance Thursday before the Senate Armed Forces Committee, Clapper reiterated the U.S. government's position that drug trafficking and the prevalence of drug cartels in Mexico is a "matter of national security interest in both countries." Read more: http://latino.foxnews.com/latino/politics/2011/03/11/intel-chief-mexico-drug-violence-poses-security-threat/#ixzz1GZkPVmI8