The device can tell if a traveler is a problem...
It does show people with their undies in a wad!

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This was also a prob with certain vid cameras. There was a feature that made some materials see-thru.

This also can happen with regular photography too. A friend at work had a picture of her and her daughter at a graduation on her desk.

I had to pick it up and look at it closely to make sure I was seeing what I saw!