Magdaleno Ruiz Jimenez huddled under a waxing moon in the rough brush of a Texas ranch. His journey to the small border community of Brackettville had been long, about 1,300 miles from his home in Chiapas, Mexico. But now a drone was buzzing overhead.

A lone officer, Sgt. Ryan Glenn, emerged from the darkness. He had a flashlight and a screen with coordinates for where Jimenez and six other men could be found on the cold caliche, blobs of heat visible to an infrared camera on the overhead drone. More officers soon arrived.

"I spent everything to get here,” Jimenez said after the officers wrested him and the other men from the brush.