Experts say the recent suicide bombing in Saudi Arabia by an al-Qaida operative who hid an improvised explosive device in his rectum highlights a "nightmare scenario" for airport security. Al-Qaida has promised an Internet primer on the technique, which has long been favored by drug mules but is new to terrorists. What can authorities do to detect such "Trojan bombers"? "Absolutely nothing other than to require people to strip naked at the airport," says aviation security consultant Chris Yates.
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