The Pentagon is claiming that they have a device which can identify people by heart beat from 200m away.
A new device, developed for the Pentagon after US Special Forces requested it, can identify people without seeing their face: instead it detects their unique cardiac signature with an infrared laser. While it works at 200 meters (219 yards), longer distances could be possible with a better laser. “I don’t want to say you could do it from space,” says Steward Remaly, of the Pentagon’s Combatting Terrorism Technical Support Office, “but longer ranges should be possible.”
A previous question determined that heart beat ID didn't work very well with sensors attached to the body, at least back in 2010.
Can this device reliably identify someone from a distance using their heart beat?