Most studies have in fact found that there are more psychopaths in males than females, so testosterone could be a very heavy factor. “Psychopathic individuals,” the study claims, “are notorious for their controlled goal-directed aggressive behavior. Yet, during social challenges, they often show uncontrolled emotional behavior.” Prof. Roelofs says this is a “paradoxical aspect of psychopathy.” Researchers hope to prove that there is “a potential imbalance in testosterone function.” So is it treatable?