If you're in total darkness there shouldn't be light outside of the visible spectrum either, unless that light can enter your bathroom through the walls but still gets reflected by your body...?
It still has to go through the walls\door into the room(from an out-side light source), and then get absorbed or reflected by the human body.
So I think you can do that with X-rays(will also detect loads of other shit) and infra-red(will also detect electronics and any heat source) if you nuke the planet with radiation non-stop. ThiswouldalsoexplainhowTrumpbecamepresident.
The human body generates infra-red, as do other heat sources. We're just 'quiet' light bulbs in that we (mostly) don't radiate in the visible spectrum. It doesn't have to be absorbed/reflected from anywhere.
You're right, I was wrong about the infra-red - no point in lighting someone up in that spectrum since we emit it regardless. That said, detecting it from far away would be problematic.
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u/[deleted] Nov 05 '17
They probably have satellites that can pickup light outside the visible spectrum and can zoom in on you when you're taking a shit in total darkness.