We asked forensic psychiatrist Dr. Michael Welner for his insights into the mass shooter, Major Hasan.
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Dr Tim Rogers, a consultant forensic psychiatrist, said he demonstrated many of the characteristics of a psychopath.
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Mr. Valle's defense also plans to call Park Dietz, a California forensic psychiatrist who examined Mr. Valle.
Most people with mental illness are not violent, said Dr. Roland Segal, a forensic psychiatrist in Phoenix, Arizona.
Following the conviction, he was assessed by consultant forensic psychiatrist Dr Michael Bond.
Dr. Mark Levy, a forensic psychiatrist in Mill Valley, California, said he doesn't think Holmes' behavior was due to medication.
The defense also chose not to call Californian forensic psychiatrist Park Dietz to testify about his examination of Mr. Valle.
"PTSD is rarely associated with homicidal violence, " Michael Welner, a forensic psychiatrist who has worked on cases of Iraq and Afghanistan veterans charged with violent crimes, told CNN's Soledad O'Brien.
The court also heard from Dr John Crichton, a consultant forensic psychiatrist and clinical director at the Royal Edinburgh Hospital, who was one of a number of psychiatrists who examined Mr Roy.
But differences between the two cases are clearer and, in some ways, should set the broader public at ease, say former detectives, law enforcement officials and a forensic psychiatrist familiar with both cases.
The decision by New York Presbyterian Hospital not to discipline Dr. Moses and to allow him to continue to operate was made in light of the negative tests and a court-ordered examination of Dr. Moses in May 2006 by a forensic psychiatrist who opined that he had no cocaine addiction problem.
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But consultant forensic psychiatrist Dr Richard Latham, for the prosecution, said: "He was able to form an intention to do lots of other things, lots of other quite purposeful things, including getting to where he got to, which is a pretty staggering feat given the level of security there was there, " he said.
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