The Pentagon has a laser that can identify people from a distance—by their heartbeat

MIT Technology Review  June 26. 2019
An individual’s cardiac signature is unique, it remains constant and cannot be altered or disguised. Researchers have developed a device called Jetson for the Pentagon which uses laser vibrometry to detect the surface movement caused by the heartbeat. It works at 200 meters (219 yards), longer distances could be possible with a better laser. A special gimbal was added so that an invisible, quarter-size laser spot could be kept on a target. It takes about 30 seconds to get a good return. They developed algorithms capable of extracting a cardiac signature from the laser signals. According to the developers Jetson can achieve over 95% accuracy under good conditions…read more.