An anonymous reader writes "The FBI insists that it uses drone technology to conduct surveillance in 'very limited circumstances.' What those particular circumstances are remain a mystery, particularly since the Bureau refuses to identify instances where agents deployed unmanned aerial vehicles, even as far back as 2006. In a letter to Senator Ron Paul last July, the FBI indicated that it had used drones a total of ten times since late 2006—eight criminal cases and two national security cases—and had authorized drone deployments in three additional cases, but did not actually fly them. The sole specific case where the FBI is willing to confirm using a drone was in February 2013, as surveillance support for a child kidnapping case in Alabama. New documents obtained by MuckRock as part of the Drone Census flesh out the timeline of FBI drone deployments in detail that was previously unavailable. While heavily redacted—censors deemed even basic facts that were already public about the Alabama case to be too sensitive for release, apparently—these flight orders, after action reviews and mission reports contain new details of FBI drone flights."