Dozens of US law enforcement agencies are quietly taking advantage of the technology that allows them to scan every object inside your home. The device, dubbed the Range-R, sends out radio waves that can detect the slightest movements, including breathing, from as much as 50 feet away. It picks up breathing, human breathing and movement within a house, they can detect bouncing off a moving object, classifying it as either a “mover” (more active) or a “breather” (less active)
Source: https://thehackernews.com/2015/01/range-r-device-see-through-walls.html