In this article by The Kansas City Star the prospects of a fail-safe lie detection system using functional magnetic resonance imaging (fMRI) are discussed. Professor Henry T. "Hank" Greely is quoted on its possibilities:

"The science may be there 10 to 20 years from now, maybe sooner, maybe never," said Hank Greely, director of the Stanford Center for Law and the Biosciences. "But it’s not there yet."