Pro Publica sums up the latest we know about the CIA's black prisons. We haven't known and still have an incomplete understanding of who was in the prisons, why, and how they were treated. Obama closed them. But only very recently have more prisoners been released. A further twenty have yet to be accounted for.
... The Senate Intelligence Committee recently completed a 6,000-page report on the CIA’s detention program. At Brenan’s confirmation hearings, Senator Jay Rockefeller (D-W.V.), said the report shows the interrogation program was run by people “ignorant of the topic, executed by personnel without relevant experience, managed incompetently by senior officials who did not pay attention to detail, and corrupted by personnel with pecuniary conflicts of interest.” Rockefeller is one of the few to have read the report, which remains classified. ...ProPublica