How to Determine Criminal Insanity

Forensic psychiatrist Dr. Park Dietz has served as an expert witness for the prosecution in the murder trials of John Hinkley, Joel Rifkin, Jeffrey Dahmer and others. In each case he presented evidence against the defense of insanity, saying that these men knew that they were committing terrible crimes. Dietz also has a consulting firm, Threat Assessment, which focuses on workplace violence. He is a consultant to the HBO special "Murder 9 to 5," which examines murder at work.

Forensic psychologist Barbara Kirwin has examined hundreds of murderers. One of her most infamous patients was Joel Rifkin, the Long Island Serial Killer, who pleaded insanity. Her book is called "The Mad, the Bad and the Innocent: The Criminal Mind on Trial- Tales of a Forensic Psychologist." (Little, Brown, & Co.) (Interview by Marty Moss-Coane)

When journalist Pete Earley's son was diagnosed with bipolar disorder, it sent him on an effort not only to get his son properly diagnosed and treated, but to understand the nation's mental health system. Earley's book about the experience is Crazy: A Father's Search Through America's Mental Health Madness.