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He seems calm, even normal

his IQ is over 140

The subjects rate whether the picture is a moral violation on a scale of 1 to 5. Kiehl says most psychopaths do not differ from normal subjects in the way they rate the photos: Both psychopaths and the average person rank the KKK with a burning cross as a moral violation. But there's a key difference: Psychopaths' brains behave differently from that of a nonpsychopathic person. When a normal person sees a morally objectionable photo, his limbic system lights up. This is what Kiehl calls the "emotional circuit," involving the orbital cortex above the eyes and the amygdala deep in the brain. But Kiehl says when psychopaths like Dugan see the KKK picture, their emotional circuit does not engage in the same way.

He notes that alcoholics have brain abnormalities. Do we give them a pass if they kill someone while driving drunk?

Neuroscience and neuroimaging is going to change the whole philosophy about how we punish and how we decide who to incapacitate and how we decide how to deal with people

Just like DNA, he believes brain scans will eventually be standard fare. And that, he and others say, could upend our notions of culpability, crime and punishment.