Traditional techniques for detecting deception, such as the lie-detector test' (or polygraph), are based upon the idea that lying is associated with stress. However, it is possible that people telling the truth will experience stress, whereas not all liars will. Because of this, the validity of such methods is questionable. As an alternative, a knowledge-based approach known as the Concealed Information Test' has been developed which investigates whether the examinee recognizes secret information for example a crime suspect recognizing critical crime details that only the culprit could know....

Traditional techniques for detecting deception, such as the lie-detector test' (or polygraph), are based upon the idea that lying is associated with stress. However, it is possible that people telling the truth will experience stress, whereas not all liars will. Because of this, the validity of such methods is questionable. As an alternative, a knowledge-based approach known as the Concealed Information Test' has been developed which investigates whether the examinee recognizes secret information for example a crime suspect recognizing critical crime details that only the culprit could know....