In this June 1, 2007, file photo, US Border Patrol Agent Alberto De Leon checks the banks of the Rio Grande, at the US- Mexico border in Laredo, Texas, an area often used by smugglers. Today, there are more than 20,000 Border Patrol agents along the US-Mexico border and a number of other federal agencies. Cities and towns along the U.S.-Mexico border have a violent crime rate below the national average, and have continued to see declines over the last decade, an Associated Press analysis of FBI crime data has found. (File | AP)