A great series of questions and answers about Able Danger at Rory O’Conner’s blog that summarizes all you need to know (before the knock on the door comes).
(more shortly)
About Michael Tanji
Michael Tanji spent nearly 20 years in the US intelligence community. Trained in both SIGINT and HUMINT disciplines he has worked at the Defense Intelligence Agency, the National Security Agency, and the National Reconnaissance Office. At various points in his career he served as an expert in information warfare, computer network operations, computer forensics, and indications and warning. A veteran of the US Army, Michael has served in both strategic and tactical assignments in the Pacific Theater, the Balkans, and the Middle East.