Pentagon has a laser that can identify people at a distance by their heartbeat

An individual’s cardiac signature is unique, though, and unlike faces or gait, it remains constant and cannot be altered or disguised. Long-range detection

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. Better than face recognition

Remaly’s team then developed algorithms capable of extracting a cardiac signature from the laser signals.

Source: www.technologyreview.com