Abstract
Perhaps in part because of dissatisfaction with the more recent (and behaviorally based) DSM conceptualizations of what constitutes a psychopath, since the 1980s the construct of psychopathy has been operationalized-at least among research psychologists-primarily using instruments developed by Robert Hare and his colleagues. ese instruments include the Psychopathy Checklist (PCL) (Hare, 1980), the Psychopathy Checklist-Revised (PCL-R) (Hare, 1991, 2003), and the Psychopathy Checklist: Screening Version (PCL:SV) (Hart, Cox, & Hare, 1995). Additionally, an instrument with highly similar item content domains, the Psychopathy20 Checklist: Youth Version (PCL:YV) (Forth, Kosson, & Hare, 2003), was developed specically for use with adolescents.
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