In this Wednesday, Aug. 10, 2011 photo, a tractor-trailer hauling a shipping container drives through giant radiation detector at the Georgia Ports Authority in Garden City, Ga. The Sept. 11, 2001, ... more 
In this Wednesday, Aug. 10, 2011 photo, a tractor-trailer hauling a shipping container drives through giant radiation detector at the Georgia Ports Authority in Garden City, Ga. The Sept. 11, 2001, terrorist attacks caused port officials and the government to reassess potential vulnerabilities terrorists might exploit to attack America _ namely the threat of a nuclear bomb or some other catastrophic weapon being smuggled into the country hidden in a ship’s cargo. (AP Photo/Stephen Morton) less 
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Associated Press | Photo By Stephen Morton
Thu, Aug 11, 2011 11:25 PM EDT