Spy vs. Spy
I don’t know what the rules are currently for the CIA, FBI, and Homeland Security but I do know that pre 9/11 it was the LAW that the CIA and the FBI did not share information. That was part and parcel of keeping the CIA out of domestic intelligence gathering and the FBI out of international affairs. So parochial considerations of these different organizations aside, it is a difficult process to gain intelligence, within the parameters of our privacy safeguards. Heaven knows the negativity surrounding the Patriot Act.