" Very little research was available relative to interviewing prison inmates, and what there was pertained specifically to convictions, probation and parole, and rehabilitation. However, the record seemed to indicate that violent and narcissistic inmates, on the whole, were incorrigible—meaning they were not able to be controlled, improved, or reformed. By talking to them, we hoped to learn if this was indeed the case. "

― John E. Douglas , The Killer Across the Table: Unlocking the Secrets of Serial Killers and Predators with the FBI's Original Mindhunter