For decades, investigators have been taught to search for signs of deception. But research increasingly points toward a better question: what makes a statement reliable? Truth spotting shifts the focus from behavioral guesswork to information that can be examined, tested, and verified.

One simple word can dramatically influence cooperation. Research on the power of “because” shows how giving a reason—even a brief one—can increase compliance and improve the way requests are received.

Reciprocity in the Interview Room: Give Something Before You Ask for Something by Stan B. Walters - The Lie Guy® ORCID 0009-0002-1063-0519   Cooperation Often Begins Before the First Important Question Interviewers naturally enter an interview thinking about what they need to get—an account, details, explanations, clarification, or perhaps an admission. Robert Cialdini’s work on influence suggests beginning somewhere else: What can I give first? Reciprocity is built around a remarkably powerful social tendency. When someone gives us something or does something for us, we often experience a sense of indebtedness—a desire to return the favor. Marketers have understood this [...]

Interview questions do more than recover information—they can influence what a person later remembers. Learn how memory contamination can affect victims, witnesses, and subjects, and why protecting memory should be treated as seriously as protecting physical evidence.

Anger can quickly derail an investigative interview when the interviewer becomes more focused on being right than gathering reliable information. Learn how managing emotional reactions, maintaining dialogue, and choosing response over confrontation can protect both the interview and its outcome.