Border Patrol Missed Dirty Bomb

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WASHINGTON (AP) -- Undercover investigators slipped radioactive material - enough to make two small "dirty bombs" - across U.S. borders in Texas and Washington state in a test last year of security at American points of entry.

Radiation alarms at the unidentified sites detected the small amounts of cesium-137, a nuclear material used in industrial gauges. But U.S. customs agents permitted the investigators to enter the United States because they were tricked with counterfeit documents.