Neuroscientist James Fallon, who has studied the brains of psychopaths using PET for almost two decades, was disturbed when he found out that his own brain and genetic makeup showed up to be similar to those of the psychopaths whom he previously studied. Other experts, however, said that aside from brain structure and genetic makeup, violent experiences in childhood also influence a psychopath's behavior. This field of study is ushering in a new kind of practice called "neurolaw," which uses neuroscience data as evidence in the courtroom.

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