Here & Now's Robin Young speaks with Richard Pacelle, professor of political science at the University of Tennessee, to find some answers.
In recent years, cross-border trucking from Mexico into the U.S. has boomed, with more than 5 million truck crossings in 2012.
For drug smugglers, getting a truckload of illegal narcotics past border authorities means potentially huge profits. At the San Diego port of entry, half of the drugs seized are discovered in cargo trucks.
From the Here & Now Contributors Network, Jill Replogle of Fronteras Desk reports on the role of cross-border trucking in the movement of goods north, and how the federal government and private trucking companies are trying to secure their loads against ever-changing smuggling strategies.