Based on the example in the cite, it seems as though TSA staffers will run a kid multiple times through the x ray if they don't get a good image the first time.
Airport security workers will now be told to make repeated attempts to screen young children without resorting to invasive pat-downs, the head of the Transportation Security Administration said Wednesday. The agency is working to put that change in place around the country, and it should reduce, but not eliminate, pat-downs for children, an agency spokesman said.
There was public outrage in April over a video of a 6-year-old girl getting a pat-down in the New Orleans airport. She was patted down, John Pistole said, because she moved during the electronic screening, causing a blurry image.
That's a good public health move.