Scanning For People Through Walls

cloudmaster writes: "RADAR-based "flashlight" for detecting movement (and respiration?) through walls and clothing: http://unisci.com/stories/20012/0416015.htm There's a bargraph that rises and falls as a person on the other side breaths... It needs to be held perfectly still, or it will detect it's own movement too, though. I wanna know why they don't just use an acelerometer to detect the devices motion and subtract that from the detected motion?"