The Proposed Homeland Security Budget for 2013
from CBO Recent CBO Publications
Since the terrorist attacks of September 11, 2001, the federal government has spent more than half a trillion dollars on homeland security—that is, activities that detect, deter, protect against, and respond to terrorist acts occurring within the United States and its territories. This CBO report summarizes the President’s proposed budget for homeland security activities in 2013 in the context of the strategic goals and missions for homeland security developed since those attacks.
http://www.cbo.gov/publication/43520