Ground-Penetrating Radar Little Help in Border Tunnel Hunt
An AP newswire article by Elliot Spagat, via Yahoo! News, reports that:
A U.S. government effort to find drug-smuggling tunnels underneath the Mexican border with ground-penetrating radar and other high-tech gear has had little success.
Human intelligence has proven to be the most effective method of finding the passageways. A case in point: The longest tunnel ever found along the border was discovered last week after a tip.