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Maybe some intelligence that people are inserting sheets of metal foil into stacks of paper to attenuate the x-rays and hide something underneath?

Assuming the airport X-ray machines aren't that powerful, I would guess that 15+ sheets of foil inserted into a book or similar might mask something underneath it fairly well?

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but it would show up as masked or dark or low energy, then they can mark as "needs manual search". That does not require forcing "all" papers out of all bags.

I was assuming many thin sheets of foil, each separated by several pieces of paper might be more subtle, than say a slab of lead. Subtle masking vs completely hiding something else under it.

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