I wouldn't have thought I was close enough for the heat of my body to be reflected off of that glass. But thinking about it, I guess if a thermal imager can detect heat from a distance, then no reason why heat can't also be reflected at a distance.
They also make little thermal imagers that can attach to a smart phone and seem to be pretty handy. There are even some smart phones with thermal imagers built in. I suspect as prices on the sensors come down, they will be found in more and more applications.
Honestly, I'm surprised that thermal imagers aren't standard issue for LEOs. As you pointed out, they are real handy for tracking down perpetrators on the run and hiding out in the woods.
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