In 1982, filmmaker Pamela Yates was filming in Guatemala. She documented the guerillas and sat down face to face with General Rios Montt, who was in power when 200,000 Guatemalans were systematically killed. Now a prosecutor in Spain is attempting to arrest General Rios Montt and bring him up on charges of genocide. To Pamela’s surprise, her outtakes are evidence. A new documentary, "Granito: How to Nail a Dictator," explores this new role.