The simple words that can expose any liar, according to a forensic linguist

A forensic linguist argues that lie detectors and body language are unreliable, and that the surest way to spot deception is to listen to what people say and how they say it. Research shows liars vary by motivation and preparation - some fabricate on the spot, others rehearse - and these differences produce detectable linguistic patterns. Key cues include repetition (stuck pronouns, repeated verbs or adjectives) reflecting cognitive load and lack of detail; foregrounding, where speakers bury the critical fact behind unnecessary background as a way to disguise prepared lies; distancing language that signals a negative affective state and an attempt to dissociate from the subject; and the absence of sensory detail in accounts of events like robberies. Studies in Psychological Bulletin (2003), the Journal of Communication Disorders (2004) and Discourse Processes (2012) support these patterns.

Concrete cases illustrate the method: a murderer repeatedly using “I” in police interviews, a fabricated assault account breaking down into repeated “fighting,” a suspect unable to supply fluent detail about a missing child, a false emergency call that delays the core incident, a partner described only as “this” after a killing, and a famous athlete inventing a robbery with limited sensory specifics. Because deception increases mental effort and disrupts normal narrative structure, trained listening for these linguistic signs can make liars easier to expose.