Behavioural analysts at the UK Emotional Intelligence Academy have since identified the 3-2-7 rule: if a suspect has a cluster of three reactions (for example, nodding, flushing and voice dropping in pitch), across two or more of the six channels that communicate emotional information (interactional style, voice, verbal content, facial expression, body movements and physiological changes) within seven seconds of the question, it is a reliable indication of deception.
