Oh. Well, in that case it seems to me that the objection to them can't be that they're invasive. We have a well-established principle that says it's okay to take photographs or video of people in public places where there's no expectation of privacy. I'm not sure I see how the fact that this uses non-visible wavelengths removes it from the scope of that principle. Can you explain that?

(I'm sympathetic to your goals here, but I think the tough questions need to be asked. They certainly will be in court.)

The simple answer is that most people expect clothing to provide privacy for what is kept under them (such as your wallet, cell phone, genitals, etc). Now when the day comes that everyone normally wears augmented reality glasses that can see terahertz / infrared radiation, and that one would normally check themselves out in a mirror with such glasses before going out, then I guess there would be no expectation of privacy for what is under you clothes.