[fragmede]

It has been rumored that the US military has heartbeat sensors (aka real-life minimap) for decades now, would this really be a new one?

[jcims]

You can pick up heartbeat and breathing rate (if they are relatively still) with simple cw radar, i did it with a $10 HB100 module and audacity.

I bet if you really worked on tuning and filtering you might even be able to pick up the vibration of a persons throat to hear what they say.