The Most Surveilled Place in America

It’s unlikely the hikers knew they were being watched. They had tried to blend in: all 11 were wearing camouflage with the intention of vanishing into the desert scrub. They were on a remote mountain trail on the outskirts of Ajo, Arizona, a former mining town of about 3,000 people just a few dozen miles north of the Mexican border. It was a warm November morning, still early enough in the day that the sun must have felt good on their skin — the air is cold up in the mountains, colder still in the dry desert winter, though the heat always finds you eventually. The sky was bright and endless, punctuated by just a few clouds. But even if the migrants looked closely, there’s no way they could have noticed the MQ-9 Predator B drone stalking...