Next Generation Lie Detectors?

Here is an interesting article out of South Carolina concerning the use of brain scans to determine whether someone is lying.  Allegedly, they are more accurate than a traditional lie detector test, results of which are not currently admissible as evidence at trial.  Nevertheless, I would still be hesitant about the use of brain scan results for many reasons - expense, confronting witnesses and self-incrimination, to name a few.