First real lie detector?

I've been waiting for this for a long time! Apparently, functional MRI can be used to tell when someone is lying. Of course, it is possible that a determined and practiced deceiver might fool the machine - further testing will be required. But just imagine the societal implications of a reliable, portable lie detector! (I can't decide whether it would more useful in business meetings or on first dates :-)

Overall, it seemed to take more brain effort to tell the lie than to tell the truth... Lying caused activity in the frontal part of the brain - the medial inferior and pre-central areas, as well as the hippocampus and middle temporal regions and the limbic areas.