A Clever Radio Trick Can Tell If a Drone Is Watching You

Published: Jan. 12, 2018, 4:30 p.m.

As flying, camera-wielding machines get ever cheaper and more ubiquitous, inventors of anti-drone technologies are marketing every possible idea for protection from hovering eyes in the sky: Drone-spotting radar. Drone-snagging shotgun shells. Anti-drone lasers, falcons, even drone-downing drones.