The behaviorists at the FBI think so. In 2008, the Behavioral Science Unit founded the Evil Minds Research Museum, dedicated to the study of serial killers and their development since infancy. Analysts use artwork, journals, and other personal possessions in an attempt to map each killer’s mind, hoping to create a kind of master profile. The core belief is that each monster would, from time to time, let the mask of sanity slip. Keyes, for one, proved this thesis wrong. As he told investigators from the outset: “There is no one who knows me, or who has ever known me, who knows anything about
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