<P> The Psychopathy Checklist or Hare Psychopathy Checklist - Revised, now the Psychopathy Checklist--revised (PCL - R), is a psychological assessment tool most commonly used to assess the presence of psychopathy in individuals . It is a 20 - item inventory of perceived personality traits and recorded behaviors, intended to be completed on the basis of a semi-structured interview along with a review of' collateral information' such as official records . </P> <P> The PCL was originally developed in the 1970s by Canadian psychologist Robert D. Hare for use in psychology experiments, based partly on Hare's work with male offenders and forensic inmates in Vancouver, and partly on an influential clinical profile by American psychiatrist Hervey M. Cleckley first published in 1941 . </P> <P> An individual's score may have important consequences for his or her future, and because the potential for harm if the test is used or administered incorrectly is considerable, Hare argues that the test should be considered valid only if administered by a suitably qualified and experienced clinician under scientifically controlled and licensed, standardized conditions . Hare receives royalties on licensed use of the test . </P>

Who developed what is considered to be the industry standard for assessing and diagnosing sociopathy