Our local police helicopter unit relies on thermal imaging devices to locate perps. from the air (usually at night). I suspect that most cruisers have them too as the prices have come down appreciably. As far as I know, it's the "latest and greatest" technology of its kind.
I'm not clear on how rocks and mud effects their function, or how long deceased (cold) a body must become before they lack a thermal image.
But regardless, the technology has come a long way from the old infrared or early starlight days.
dju
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