"Psychopaths are More Common than You Think...Psychopaths are Everywhere...Psychopaths are Notoriously Skilled at Deception...Psychopaths are Especially Adept at Negotiating, Manipulating and Climbing Hierarchies"
http://www.divinedominoes.com/docs/Psychopathy-systemsthinkerdotcom-.pdf
Source: http://www.systemsthinker.com/interests/mind/psychopathy.shtml