The Center's fifth annual border tour began in San Diego earlier this month. On our week-long itinerary we saw most of the California border, from both sides of the fence, and made it as far as Yuma, Ariz. In five trips, we have now seen almost the entire 1,993-mile southwest border, from Brownsville to the Pacific. These excursions are mere snapshots of a particular area, but we meet with enough people to get a sense of current trends. Our most recent trip underscored the ever changing nature of cross-border traffic and why managing it requires sustained political will and vigilance.