“…In fact, almost every negative descriptor proposed by Cleckley (1976) has been examined by one research study or another. Nevertheless, the bulk of research efforts investigating the characteristics of antisocial individuals has been targeted on subjects drawn from problematic social groups including criminals (Hare, 1970;Lidberg et al, 1978;Widom, 1976), institutionalized juvenile delinquents (Skryzpek, 1969;Stewart, 1972), and alcoholics and drug addicts (Hill et al, 1962;Sutker, 1971;Vaillant, 1975). Conclusions based on such subject samples are biased by their extremeness and by the psychological, biological, and physical conditions under which subjects are found and data collected.…”