What is the role of the CIA in domestic counterterrorism efforts (both domestic and international terrorism)?

What is the role of the CIA in domestic counterterrorism efforts (both domestic and international terrorism)?
How has that role changed to its current status?
What is the legal basis for this requirement of having an agency authorized to engage in domestic investigations involved in overseas contingency operations?
Based on the attacks undertaken or stopped in the United States over the past 10 years, and considering their lack of a common ‘unifying’ coordinating entity (e.g., AQ planning, controlling, financing, and ordering), does the current homeland security construct of the United States adequately meet the existing threat profile?
Is the on-going financial commitment of billions of dollars a year in federal spending on purely CT efforts warranted?

 

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