As violent drug cartels take over Mexico and expand their criminal enterprises north, the United States has signed a “trusted traveler” agreement that allows pre-screened Mexican airline passengers to bypass lengthy airport security checkpoints. The foreigners will get “trusted traveler cards” with fingerprints and other biometric data and they must answer customs declarations questions on touch-screen kiosks before leaving airport inspection areas. Homeland Security Secretary Janet Napolitano claims it’s a way to enhance information sharing and mutual security in the face of “ever-evolving, multinational threats.” About 84 million Mexicans are expected to qualify for the trusted traveler program, according to...