Mark Costanzo and Daniel Krauss’s text show students how psychological science can be used to reduce crime, improve legal decision making, and promote justice. Fully integrated discussions of real cases and trials, along with other examples of the legal system in action, show how research and theory can deepen our understanding of suspects, criminals, police, victims, lawyers, witnesses, judges, and jurors. Using a highly accessible and lively writing style, the authors demonstrate the relevance of key research findings to virtually every aspect of the legal system that psychologists have studied.