Deception is an all-too-common human activity, one that succeeds because we cannot always detect it in others. It complicates all sorts of human decision-making, including attributing guilt for criminal offenses. The law relies on human fact-finders to determine whether criminal defendants claiming innocence, as well as witnesses testifying about a case, are telling the truth. But the fallibility of human lie detection has fueled the search for a more accurate replacement. Scientists have developed new approaches to lie detection that use a brain scanning technique called functional magnetic resonance imaging (fMRI) to evaluate whether someone is lying.
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