I have heard the military has developed ways to “see” you through the walls of your home, if they so wish to do so.
The method has something to do with observing the heat mass image of your body, which may be seen in one color, against the immediate surrounding atmosphere in that room, that is manifested as a cooler tone or color. This was originally used to locate terrorists in their homes
I heard about this years ago, after Osama Bin Laden had only “died” about four times.
IIRC that technology was banned for use by LEO’s several years ago.