A former American army torturer has laid bare the traumatic effects of American interrogation techniques in Iraq - on their victims and on the perpetrators themselves.
Tony Lagouranis conducted mock executions, forced men and boys into agonising stress positions, kept suspects awake for weeks on end, used dogs to terrify detainees and subjected others to hypothermia.
But he confesses that he was deeply scarred by the realisation that what he did has contributed to the downfall of American forces in Iraq.
He says that he realised he had entered a moral dungeon when he found himself reading a Holocaust memoir, hoping to pick up torture tips from the Nazis.
Mr Lagouranis, who held the rank of specialist, equivalent to a lance corporal, says he never beat a prisoner. But he said: "These coercive techniques - isolation, dogs, sleep deprivation, stress positions, hypothermia - crossed a legal line because they violated the Geneva Convention.
