His name is similar to someone on the "no fly" list:

A five-year-old boy was taken into custody and thoroughly searched at Sea-Tac because his name is similar to a possible terrorist alias. As the Consumerist reports, "When his mother went to pick him up and hug him and comfort him during the proceedings, she was told not to touch him because he was a national security risk. They also had to frisk her again to make sure the little Dillinger hadn't passed anything dangerous weapons or materials to his mother when she hugged him."

The explanation is simple: to the TSA, following procedure is more important than common sense. But unfortunately, catching the next terrorist will require more common sense than it will following proper procedure.

If I ever get to interview Kip Hawley again, I'll ask him about this.