The US Department of Defense has given Dr Jennifer Vendemia a $5m grant to work on her theory that by monitoring brainwaves she can detect whether someone is lying.

She claims the system has an accuracy of between 94% and 100% and is an improvement on the existing polygraph tests, which rely on heart rate and blood pressure, respiratory rate and sweatiness.



Her system involves placing 128 electrodes on the face and scalp, which translate brainwaves in under a second. Subjects only have to hear interrogators’ questions to give a response.



But the system has a long way to go before it replaces polygraphs, which were invented almost a century ago and remain a tried and tested system of deception detection.



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