ABSTRACT
The Hare Psychopathy Checklist (PCL; Hare, 1980) and its Revision (PCL–R; Hare, 1991, 2003) have been instrumental in creating a scientific basis for investigating the construct of psychopathy in adults. In developing the PCL, Robert Hare provided a psychometrically sound assessment instrument to identify psychopaths as adults that has led to enormous strides in our understanding of this complex disorder. In the two decades since the PCL was first published a significant amount of research on psychopathy has been done. Consider the number of dissertations related to psychopathy since 1960: Between 1961 and 1970 there were eight, between 1971 and 1980 there were 13, between 1981 and 1990 there were 17, between 1991 and 2000 there were 107, and between 2001 and 2004 there were 69.
