U.S. officials set up a human-intelligence laboratory at Guantnamo that used interrogation and detention practices they largely made up as they went along. The secret summaries, which were obtained via WikiLeaks, help explain why in May 2009 President Obama, after ordering his own review of wartime intelligence, called ... Guantnamo quite simply a mess." The documents ... show an intelligence operation that was tremendously dependent on informants - both prison-camp snitches repeating what they'd heard from fellow captives, and self-described, at times self-aggrandizing, former al-Qaida insiders turned government witnesses who Pentagon records show have since been released. Intelligence analysts are at odds with each other over which informants to trust, at times drawing inferences from prisoner exercise habits. They ordered DNA tests, tethered Taliban suspects to polygraphs and strung together tidbits in ways that seemed to defy common sense. The documents also show that in the earliest years of the prison camp's operation, the Pentagon permitted Chinese and Russian interrogators into the camps - information from those sessions are included in some captives' assessments - something American defense lawyers working free for the foreign prisoners have alleged and protested for years.