From breaking the law to breaking a promise, how do people lie and how can they be caught? Paul Ekman, a renowned expert in emotions research and nonverbal communication, has now updated his groundbreaking inquiry into lying and methods for uncovering lies. From the deception strategies of international public figures, such as Adolf Hitler and Richard Nixon, to the deceitful behavior of private individuals, including adulterers and petty criminals, Ekman shows that a successful liar most often depends on a willfully innocent dupe. His study describes how lies vary in form and can differ from other types of misinformation, as well as how a person's body language, voice, and facial expressions can give away a lie but still escape the detection of professional lie hunters—judges, police officers, drug enforcement agents, Secret Service agents, and others. Photographs and line drawings.