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I flew through three airports with backscatter machines last week. I had a small child with me. Each time i was directed to the regular metal detector - and in one case where my child walked ahead and was about to go through the backscatter machine, she got called back by the TSA person with some agitation and directed through the metal detector instead.

I don't have enough data points to know for sure, but I am wondering if they are purposefully not screening kids in these things and if so, are they doing so due to the radiation exposure concerns.

Like the OP, I never saw anybody opt out.

Alternately, they may be concerned about having pictures of naked children stored on the hard drive.

Or both!

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