4 drug tunnels found along US-Mexico border
Drug Tunnel
In this undated photo provided by the United States Drug Enforcement Administration, shows 39 pounds of methamphetamine smuggled through a 240-yard, complete and fully operational drug smuggling tunnel that ran from a small business in Arizona to an ice plant on the Mexico side of the border, Thursday, July 12, 2012, in San Luis, Ariz.(AP Photo/Drug Enforcement Administration)



