Flop Sweat Saves Lives

First with the Shoe Bomber, then with the Underwear Bomber (Pantybomber, Fruit of the Boom, whatever), major catastrophes were averted because the terrorists chose to conceal the bombs on the sweatiest parts of their bodies, thereby futzing up their explosives.  How long before they figure this out, or until they discover the Western technological miracle known as “Zip-Loc”?