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There are tons of ways to defeat it. If the courts don't stop the scanners, I plan to design and market a scan-proof holster :)

Yes. It's trivial to defeat. Proprietor reports that he can't keep them on the shelf.

If these are terahertz-band scanners, I believe most metals will block the waves.

So, tin foil hoodies? Or maybe chain mail will come back in style?

I haven't encountered one of these yet, but I'd actually be willing to go through if I had some sort of metallic pre-wash all over my clothes.

Apparently there are a number of problems with terahertz technology, meaning potential methods of fooling them.