05/18/09 — Even at a time when threats, potential threats and imagined threats are becoming ever more high tech, one of the lowest-tech methods of sneaking people and contraband into the U.S. is one of the thorniest problems facing the U.S. Border Patrol. Since Sept. 11, 2001, more than 30 smugglers’ tunnels have been located and shut down near San Diego – whose position right on the Mexican border has made it a hotspot for both cross-border industrial projects and illegal smuggling of workers and drugs. Since 2006, when Congress passed the Secure Border Fence Act, which launched a series of projects…