Passengers who are asked to undergo a second screening can choose a pat-down search or the millimeter-wave test.

CNN: TSA trying new airline passenger screening machines

If the search for knives truly is the culprit that's clogging up screening lanes, maybe those who bring them should be fined.

CNN: Is TSA serious about letting people carry knives?

Mass screening of this sort is not, itself, a new idea in the search for drugs, but extending it so that it can study effects on entire animals rather than just isolated cells should make it even more productive.

ECONOMIST: A better way to find novel antibiotics