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Currently you are able to watch "Most Evil - Season 2" streaming on Discovery+ Amazon Channel, Discovery + or buy it as download on Amazon Video, Apple TV.
Columbia University Professor Dr. Michael Stone is forensic psychiatrist and personality expert who developed "The Stone Scale," also known as the “Gradations of Evil.” The scale uses forensic analysis to score serial killers and psychopaths between 1 and 22, indicating just how evil each individual is.