The Guardian reports that the U.S. government is looking for a way to spot evildoers by scanning for “physiological abnormalities.” A call for proposals says:
Early research has shown that pupil size varies with changes in a person’s cognitive processing load. Current but unproven studies suggest that a cognitive decision to deceive or practise deception will result in an increased pupil size due to the greater cognitive processing required in comparison to truthful recall.
Sounds more than a bit like the Voight-Kampff replicant-detector test from Blade Runner (it was Philip K. Dick’s idea, Guardian, not Ridley Scott’s). The reporter adds an appropriate note of skepticism:
I wonder how often a system might raise a false alarm, since a lot of people are pretty stressed going through airports even when they’re not up to anything mischievous.