The story that the CIA uses tiny homing beacons to guide their drone strikes in Pakistan may sound like an urban myth. But this sort of technology does exist, and might well be used for exactly this purpose. It might even have been the “secret weapon” that Bob Woodward said helped the American military pacify Iraq.
The military has spent hundreds of millions of dollars researching, developing, and purchasing a slew of “Tagging tracking and locating” (TTL) gear — gizmos designed to keep covertly tabs from far away. Most of these technologies are highly classified. But there’s enough information in the open literature to get a sense of what the government is pursuing: laser-based reflectors, super-strength RFID tags, and homing beacons so tiny, they can be woven into fabric or into paper.