Kaing Kuek Eav, better known as Duch, who ran the Khmer Rouge's S-21 torture centre has admitted at the UN backed genocide trial in Cambodia that most of the confessions obtained from prisoners were not true, but they were executed anyway. <br /><br />But S-21 was only one of dozens of similar prisons around the country.<br /><br />Al Jazeera's Stephanie Scawen reports.
