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The Lie Detection Field Manual

Ten tells a detective never ignores. After 1,000+ interviews and interrogations, the patterns are clear — where lies emerge, what to watch for, and what to do in the moments after your gut tells you something is off.

Joshua Mason spent 13 years in law enforcement, including more than a decade as a detective conducting interviews and interrogations, and holds a master's degree in psychology. He writes about deception, manipulation, and human behavior for over 25,000 readers on Medium.