US PRESIDENT BARACK OBAMA ON APRIL 16, 2009 GRANTED IMMUNITY TO

(FILES): This April 25, 2007 file photo shows an improvised record of detainees treated still seen on the plywood wall of the hospital facility at Camp X-Ray, long ago abandoned for more modern facilities, at the US Naval Station in Guantanamo, Cuba. US President Barack Obama on April 16, 2009 granted immunity to CIA officers involved in tough terror interrogations as he released graphic memos detailing harsh methods approved by ex-president George W. Bush. In the documents, Bush-era legal officials argued that such tactics that Obama has since disowned such as simulated drowning, facial slapping, the use of insects to scare prisoners and sleep deprivation did not amount to torture AFP PHOTO / Files / Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)