On a recent Friday night in Phoenix, an unmarked white Department of Homeland Security bus pulls up to a curb near the Greyhound bus station.
The door swings open and 15 young men and women from India step off. In the scorching summer heat, they climb into waiting cars and taxis, cramming as many passengers inside as possible before they are driven off into the night.
A half-hour later, a second DHS bus pulls up to the same spot. Twenty Indians climb into cars and taxis, and like the first group, speed off.