To get past surface-level answers and understand someone's true motivations, ask them to go deeper than their initial statement. Then ask again, and a third time. This simple technique pushes past rehearsed responses, and the third answer is typically the one closest to the real truth.

Most people rarely lie and therefore operate with a "truth bias," assuming others are also being truthful. This cognitive default, while efficient for most interactions, becomes a major vulnerability that people with dark personality traits exploit. They can lie frequently because it rarely occurs to others to question them.

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.

People are practiced and guarded during formal meetings. To understand their true nature, Negreanu suggests engaging with them in informal environments like a meal or drinks. This disarms them, making their reactions more authentic and revealing.

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.

According to "Truth Default Theory," telling the truth is our natural, low-effort state. Lying is cognitively demanding as it requires inventing and tracking a false narrative, which violates the human tendency toward cognitive ease.

When trying to deceive someone, admitting a genuine, less critical flaw can make you seem honest and self-aware. This vulnerability makes the primary lie more credible because the listener thinks, "Why would they tell me this bad thing if the other part wasn't true?"

Manipulative individuals often betray their intentions through "danger zone" cues they cannot control. These include lip pursing (a universal withholding gesture), physically distancing from a statement, and a significantly increased blink rate, which indicates the high cognitive load associated with deception.

When people are nervous or lying, their blink rate often increases dramatically. This is an unconscious 'eye blocking' behavior where the brain tries to shut out external stimuli to process the cognitive load of deception. It's a danger zone cue that manipulators cannot easily control.