By The Numbers:

• Roughly 8 out of 10 people busted in the Border Patrol's Big Bend sector between 2005 and 2011 were Americans caught at a checkpoint.

• Eighty-eight percent of the seizures – mostly marijuana – at Sierra Blanca, the sector's largest station, were traffic stops for amounts below drug-trafficking thresholds.

• Three out of 4 people the U.S. Border Patrol catches with drugs nationwide are U.S. citizens.

• Less than 10 percent of drugs that are smuggled into the country are seized by U.S. law enforcement, according to an estimate by Eric Olson, associate director of the Latin American Program at the Woodrow Wilson International Center for Scholars, a nonpartisan think tank in Washington, D.C.