EPIC Carnivore FOIA Litigation - Includes legal documents presented by the privacy group seeking the public release of all FBI records concerning Internet monitoring system.
FAQ - Carnivore FAQ - Describes how Carnivore works -- it chews all the data, but only eats the information authorised by court order.
The Register: How Carnivore Works - Article describes the handy, idiot-proof GUI that lets nosey Feds examine a broad range of what passes through.
