The Nuke Pipeline

Checkpoint guards must watch for smugglers sneaking tiny samples of their wares

BORIS GRDANOSKI/AP

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For now, Washington is simply feeling its way, trying to balance security and cost while tending to the countless other battles it must fight on the home front. Given the power of even a single rogue nuke, however, this battle is clearly one of the most important. "The consequences of failure would be far worse than Sept. 11," says Alexander Strezov, a Bulgarian scientist who helps investigate trafficking cases. "To be honest, I don't want to think about it." The U.S., unfortunately, doesn't have that luxury.

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President BARACK OBAMA, at NATO talks involving over 50 world leaders, describing the withdrawal of 130,000 combat troops from Afghanistan, planned for the end of 2014
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