Drones have been used after disasters to help first responders locate bodies and map the area. Now, they could have technology discover if the person found is still alive. The technology is being coded to look for signs of movement and life, such as rhythmic breathing movements. Video footage of eight people and one mannequin, all with reflective material on their chest to more easily show movement, were analyzed by a system with machine learning. Researchers have also said the system could still work on people who are only partially exposed.