Law relies on a conception of human agency, the idea that humans are capable of making their own choices and are morally responsible for the consequences. But what if that is not the case? Over the past half century, the story of the law has been one of increased acuity concerning the human condition, especially the workings of the brain. The law already considers select cognitive realities in evaluating questions of agency and responsibility, such as age, sanity, and emotional distress. As new neuroscientific research comprehensively calls into question the very idea of free will, how should...