It always starts innocuously, doesn’t it? Autonomous drones look like good bets for home security cameras or hands-free versions of selfie sticks. But could they be used to track a person running through the woods, or a fleeing car? Short answer: Yes. The commercially-available Skydio drone uses 6 4K cameras and AI to 3D-map its surroundings and avoid obstacles as it follows whatever object (or person) it’s tasked with following.