Drug smuggling tunnels on the U.S.-Mexico border

Between October 2008 and November 2011, law enforcement officers in the United States discovered over 70 underground tunnels that were used by drug smuggling groups to move illegal drugs into the United States from Mexico.  The number of tunnels discovered within the 3 year time period is higher than the number of tunnels discovered between 2002 and 2008.

Source: Associated Press, “Authorities discover another border drug-smuggling tunnel in San Diego,” Washington Post, November 29, 2011.