On trial is Jimmy Moran, who at 18 took part in a store robbery during which the storeowner's wife was shot and grievously injured. Presiding is distinguished U.S. District Judge Jed S. Rakoff, who has a longstanding interest in neuroscience and its conceivable effect on criminal law. The trial raises common questions: Is a witness lying? How reliable is eyewitness testimony? What's the best way to avoid a biased jury? How well can the defendant's intentions be judged? Alan Alda explores how brain-scanning technology is providing insights into these questions and discusses the implications of neuroscience entering the courtroom.