After terrorists bombed four commuter trains in Madrid this spring, reports the Los Angeles Times, Homeland Security Secretary Tom Ridge summoned leaders of the U.S. mass transit industry and said, "We need to make sure your systems are secure. Shall we do it in the same way we did the airports?" Transit officials were aghast because checking for shoe bombs at subway turnstiles or running backpacks through X-ray machines at bus stops could paralyze the transportation system. No easy, quick, inexpensive, or wholly effective answers are in sight. Industry officials and some lawmakers want at least $5 . . .
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