Psychopathy is most commonly assessed with the Psychopathy Checklist, Revised (PCL-R) created by psychologist Robert D. Hare. Each of the 20 items in the PCL-R is scored on a three-point scale, with a rating of 0 if it does not apply at all, 1 if there is a partial match or mixed information, and 2 if there is a reasonably good match to the offender. This is said to be ideally done through a face-to-face interview together with supporting information on lifetime behavior (e.g. from case files), but is also done based only on file information. It can take up to three hours to collect and review the information.
|Factor 1||Factor 2|
|Facet 1 Interpersonal||Facet 3 Lifestyle|