The classic checklist for psychopathy was developed in 1980 by Prof Robert Hare, who is still the recognised giant of the territory. The 20 traits, which ranged from pathological lying to a lack of empathy, were based entirely on prison populations. This worked because not only did Hare have the benefit of a large sample, with pronounced psychopathic behaviours, but he was able to compare interviews and self-reporting with data collected about the individuals – so inconsistencies…
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