Interview Methods
Detecting Deception in Interviews: Why Body-Language Myths Fail
Gaze aversion, fidgeting and crossed arms are not reliable signs of lying. This article explains what the evidence actually shows and how to build a defensible approach.
The comforting myth of the tell
Popular training still teaches that liars avoid eye contact, touch their face, or shift in their seat. Decades of research show these cues have little to no reliable relationship with deception. Anxious truth-tellers display them constantly, and prepared deceivers often do not.
What the evidence supports
The most robust gains in deception detection come from the content of the account, not the body. Strategies that work in controlled studies include:
- Cognitive load: lying is mentally taxing, so asking for detail, reverse-order recall, or unexpected questions widens the gap between truthful and fabricated accounts.
- Evidence disclosure timing: revealing what you know gradually, rather than up front, constrains a deceptive account and exposes inconsistencies.
- Consistency over time and detail: assessed against verifiable facts, not against a gut feeling.
Why this matters for fairness
Relying on body-language myths does not just reduce accuracy — it produces confident, wrong judgements that can wrongly implicate innocent people. An evidence-led interview keeps the focus on what can be checked and recorded.
Practical takeaways
- Drop the demeanour checklist.
- Increase cognitive load with open, unanticipated questions.
- Disclose evidence strategically.
- Judge the account against facts, not nerves.
Deception detection is hard, and honest interviewers acknowledge the limits. The goal is a reliable account — not a confident guess.