A K-9 police officer and his partner, "Bart," patrol New York's Grand Central Terminal in 2003. Less visible are the clandestine security measures the government has implemented since 2001.
August 30, 2011 Washington Post national security reporter Dana Priest's book Top Secret America looks at the top-secret intelligence and counterterrorism network created after Sept. 11. "No one knows how much money it costs, how many people it employs, [or] how many programs exist within it," she says.
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