According to a photo posted by ABC News, the bomb allegedly smuggled on board Northwest Flight 253 last week was a packet of powder sewn into the bomber's underwear . Note the packet's location: right in the crotch, where a TSA pat-down is least likely to catch you.
How do you find a nonmetallic bomb tucked into such a private place? By looking right through the bomber's clothing with a naked-body scanner. Check out the Washington Post's analysis of the available technologies for spotting a bomb like this one. The far-right column, "whole-body imaging," looks like our best shot.