[lancewiggs]

X-rays used to be very popular for shoe fitting. I strongly suspect that millimeter waves have similar long term health issues. And I don't see many getting naked in front of a 3D video camera set-up.

[nitrogen]

Millimeter waves are not ionizing, while the x-rays used by TSA backscatter machines and medical x-rays are.

[dredmorbius]

The question isn't whether or not they're ionizing. The question is whether or not they have adverse biological actions.

[noonespecial]

Its highly likely that those are in fact the same question.

[dredmorbius]

Not when asked by me.

http://scholar.google.com/scholar?q=physiological+effects+of...

My general sense: any health effects are likely to be weak at levels typically encountered, but I'm holding as plausible that thee may be some effects.

[aortega]

Microwave oven radio waves are non-ionizing 2.4 Ghz and I suspect they cause several health issues to any living organism exposed to them, even for a short time.

[lawnchair_larry]

They aren't, unless you're in the oven. And that's different.

[stcredzero]

One wouldn't have to be naked. With the right kind of camera and lighting, customers could also be wearing an opaque gown. (Some care would have to be taken to ensure that the software isn't tampered with.)