Prison populations continue to offer several advantages for the study and measurement of psychopathy: high prevalence and the availability of extensive amounts of “hard” information about the individual. The selection of several items and the scoring protocols was influenced by the nature of the population with which the research was being conducted, namely incarcerated offenders. The development of the PCL-R (and its predecessor, the PCL) was based on a rich clinical tradition that included the writings of, among others, Benjaman Karpman, Silvano Arieti, William and Joan McCord, and, especially, Hervey Cleckley. There was little evidence that these methods were conceptually or empirically related to one another, with the result that many research findings obtained with one method could not be replicated with other methods. The PCL-R had its origins in the late 1970s at a time when a variety of clinical and self-report methods were being used to define what ostensibly was psychopathy.
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