So, supposedly, our heartbeats form a “cardiac signature” that is more unique than our faces.
An individual’s cardiac signature is unique, though, and unlike faces or gait, it remains constant and cannot be altered or disguised.
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.
…the new device, called Jetson, uses a technique known as laser vibrometry to detect the surface movement caused by the heartbeat. This works though typical clothing like a shirt and a jacket (though not thicker clothing such as a winter coat).
So, won’t work so good during winter. Otherwise, kinda hard to avoid unless you have some kind of vibrating device built into your clothing.
