Effective lie detection is less about spotting non-verbal tics and more about strategic questioning. Asking open-ended and unanticipated questions dramatically increases a liar's cognitive load, making deception harder to maintain and revealing the true cues of falsehood.

Truthful people are at peace with the truth, even if you don't believe them. Liars, however, often have a disproportionate, indignant response when their lie isn't accepted. They cannot stand that you don't believe them because their narrative is fragile.

The most consistent indicator of lying is providing sparse information, not excessive detail, due to the high cognitive load of inventing a story. Asking "tell me more" is an effective way to expose this, as truth-tellers can elaborate easily while liars struggle.

The common belief that you can accurately read emotions from faces is a myth. Seminal studies used posed, extreme expressions not seen in real life. Context is far more critical, and our conviction in our ability to read faces vastly outstrips our accuracy.

There are no universal cues for lying. Instead of assuming a gesture like crossed arms means someone is being deceptive, view it as a change in their state. This change is a signal to become curious and ask clarifying questions.

There is no single giveaway for lying that applies to everyone. The key is to first understand an individual's normal pattern of speech and behavior (their baseline). Deception is revealed through deviations from this norm, such as adding excessive, unnecessary details to a story to bolster its credibility.

We consistently overestimate our ability to detect lies by reading body language. Empirical research shows our accuracy is only slightly better than a coin flip (around 54%), yet the belief in this skill persists as a strong cognitive bias.

Contrary to popular belief, lack of eye contact is not a reliable indicator of deception. Liars are aware of this stereotype and often consciously maintain or intensify eye contact to appear more truthful. Fidgeting is similarly unreliable.

Pay close attention to minor lies or inconsistencies, like someone claiming to be a vegan but eating meat. These small inauthenticities reveal a core inability to be truthful and are strong indicators of how they will handle more significant matters.