CNN CNN Presents May 7, 2012
atrocities to emerge from the war in afghanistan. in a chilling shooting rampage, sergeant robert bales allegedly shot down 17 civilians. his lawyer says he may have had post-traumatic stress disorder. a diagnosis that could be used in his defense. that is a scene playing out more and more in courtrooms around the country. vets charged with violent crimes are saying ptsd made them do it. and juries are having to decide, should ptsd be a defense for murder? chris lawrence investigates. >> reporter: raymond williams had worked his whole life for this moment. just retired. looking forwa...