Pentagon has a laser that can identify people at a distance by their heartbeat
I saw a demonstration of this technology a few years back, at a European military-industrial contractor for which I worked.It was being pitched as the ideal way to assassinate people in a crowd - identify them by heartbeat signature, fly a drone in to drop a small explosive package on their heads.When I later saw that biometric information was being harvested by the same company at airports around the world, I figured - time to get a different job.  So I quit.And now, the tech of individually-targeted assassinations is coming to market.