"Congress finds the following: (1) Trafficking and smuggling organizations are intensifying their efforts to enter the United States through tunnels and other subterranean passages between Mexico and the United States. (2) Border tunnels are most often used to transport narcotics from Mexico to the United States, but can also be used to transport people and other contraband. (3) From Fiscal Year 1990 to Fiscal Year 2011, law enforcement authorities discovered 149 cross-border tunnels along the border between Mexico and the United States, 139 of which have been discovered since Fiscal Year 2001. There has been a dramatic increase in the number of cross-border tunnels discovered in Arizona and California since Fiscal Year 2006, with 40 tunnels discovered in California and 74 tunnels discovered in Arizona. […] It is the sense of Congress that-- (1) success in combating the construction and use of crossborder tunnels requires cooperation between Federal, State, local, and tribal officials and assistance from private land owners and tenants across the border between Mexico and the United States; (2) the Department of Homeland Security is currently engaging in outreach efforts in California to certain landowners and tenants along the border to educate them about crossborder tunnels and seek their assistance in combating their construction; and (3) the Department should continue its outreach efforts to both private and governmental landowners and tenants in areas along the border between Mexico and the United States with a high rate of cross-border tunnels."
Public Law 112-127
Government Printing Office, Federal Digital System: http://www.gpo.gov/fdsys/