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No lie detector is anywhere near foolproof, and existing techniques, including polygraph tests and brain scans, have the added drawback of requiring specialised, expensive equipment, says Aldert Vrij, a forensic psychologist at the University of Portsmouth, UK.
Vrij wondered whether asking someone to draw a scene might work instead: as liars have not had direct visual experience of what they are describing, they might draw a scene differently to someone who was actually there.
Using the “sketching the agent” result alone, it was possible to identify 80% of the truth tellers and 87% of the liars – results superior to most traditional interview techniques.
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