Lie detection—and more specifically, the polygraph machine—has only proven to blur the line between innocence in guilt. Scientists agree that it is often leaned too heavily upon considering its dubious results. Does the invention of a more accurate, “perfect” lie detector solve this problem? Or does it only create a breach of privacy? John-Dylan Haynes and Frank Tong discuss how advances in brain scanning could play into this grey area of grey matter.

Image courtesy of Vibragiel; Recorded June 2009; Posted July 2011