The Wall Street Journal reports that federal agents believe that the number of unauthorized border crossings is down:

The Border Patrol and some experts say tougher measures and a greater number of agents on the ground are discouraging border crossings from Mexico. Experts also cite tougher state laws, particularly in Arizona. Economists and others point to another key influence: the state of the U.S. economy, in particular the ailing housing industry.

Border apprehensions in the Yuma sector of Arizona--which passed an employer-enforcement measure last year--have fallen 76%.