Very carefully. The CIA agreed to provide Intelligence Committee staffers with documents regarding the program, but only at a secure CIA facility near agency headquarters in Langley, Va., not in the Senate itself.
The agency set up a sparsely furnished work area for the staffers, complete with its own computer network. These computers were isolated from CIA networks. The only agency employees permitted to access them were information technology workers, according to an agreement reached between Feinstein and the CIA. Agency higher-ups were supposed to keep their hands off the inquiry.