Would I Lie to You? Part 2 of 2 (broadcast edition) and The Private Life of a Brain Surgeon (podcast & Radio Australia edition)

Many scientists distrust the traditional lie detectors, like the polygraph with its wires and electrodes stuck to the skin, and say they never reliably reveal a liar. But now companies are marketing voice stress analysers and even brain scanners to do 'truth verification'. BBC science journalist Roland Pease investigates whether the new technologies are any better than the old ones. For copyright reasons, this week's podcast and online edition is an alternative from our archives, The Private Life of a Brain Surgeon.