"Be vigilant at all times," Jesus counsels his disciples in this Sunday's gospel. Guards at the U.S.-Mexico border vigilantly search for contraband but worry that a program that offers trusted trucking companies speedy passage across U.S. borders is being hijacked by Mexican drug smugglers. Large shipments of illegal drugs have been discovered in recent months.

Most trucks enrolled in the program pause at the border for only 20 seconds before entering the United States. And nine out of ten of them do so without anyone looking at their cargo.

But among the small fraction of trucks that are inspected, authorities have found multiple loads of contraband, including nearly 13 tons of marijuana seized in a three-week period last spring. Some experts now question whether the program makes sense in an environment where drug traffickers are willing to do almost anything to smuggle their shipments into the U.S.

The trusted-shipper system "just tells the bad guys who to target," said Dave McIntyre, former director of the Integrative Center for Homeland Security at Texas A&M University.

The government keeps the list of participants hidden, citing national security and trade secrets. But some of the 9,500 companies who are part of the system advertise their membership to drum up business, making them targets for smugglers who can then threaten drivers or offer them bribes.

More than half of all U.S. imports now come from companies in the program, called the Customs-Trade Partnership Against Terrorism, or C-TPAT. Mexican trucking companies make up only 6 percent of global membership in the system but they account for half of its 71 security violations during the past two years.

Stephen Flynn, senior fellow for Counterterrorism and National Security Studies at the Council on Foreign Relations, said truckers do not feel safe rejecting bribes, no matter what agreements their companies have made with the U.S. government. "The basic vulnerability for a truck driver remains the 'plata-or-plomo' dilemma," Flynn said, using Spanish shorthand for taking a bribe or a bullet.

Source: An article by Christopher Sherman for the Associated Press