Lots More Information

• How Serial Killers Work
• How Jack the Ripper Worked
• How Police Interrogations Work
• How Crime-scene Investigation Works
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• BBC News: What makes a psychopath?
• CourtTV Crime Library: Psychopathy
• RxPG News: Criminal Psychopaths showed reduced activation in brain when processing emotional facial expressions
  

Sources

• "Cri­minal Psychopaths showed reduced activation in brain when processing emotional facial expressions." RxPG News. Dec. 1, 2006.
  
• "Psychopaths' brains 'different'." BBC News. Dec. 4, 2006.
  
• Ramsland, Katherine. "All About Dr. Robert Hare: Expert on the Psychopath." CourtTV Crime Library.
  
• Ryan, Caroline. "What makes a psychopath?­" BBC News. Sept. 18, 2003.