Psychological research can provide constructive explanations of key problems in the criminal justice system—and can help generate solutions. This state-of-the-art text dissects the psychological processes associated with fundamental legal questions: Is a suspect lying? Will an incarcerated individual be dangerous in the future? Is an eyewitness accurate? How can false memories be implanted? How do juries, experts, forensic examiners, and judges make decisions, and how can racial and other forms of bias be minimized? Chapters offer up-to-date reviews of relevant theory, experimental methods, and empirical findings. Specific recommendations are made for improving the quality of evidence and preserving the integrity of investigative and legal proceedings.