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Analogue wired cameras come in at a few dozen mW. And those aren't actually low power or anything, I bet you can get cameras using far less than that.

Cameras with built-in DSP and WIFI probably won't fit into that power envelope, though.

Yes, but that requires an expensive far-IR imager.

One would need to look up the type of battery and how long the camera runs on that.

I think it's a good idea, but especially in cases of non-continuous monitoring (e.g. 1 FPS or way less) with modern low power electronics this could become quite difficult.

That's the best idea I have heard so far.

Better yet, would be a law passed that outlaws photographing people without their consent, at least while at work. I heard France has strict laws that protect privacy.

I've never liked my picture taken without my consent.

Assuming your work takes you anywhere outside, or in a vehicle, or in any public area, you have no reasonable expectation of privacy.

You can't reasonably expect someone photographing a public place to announce to everyone they're about to take a photograph, or get a waiver from everyone, or blur the faces of everyone who they can't get to sign.