Next steps for 'brain-fingerprinting' in solving real crimes

New Zealand scientists are taking the next steps in developing Forensic Brainwave Analysis (also known as 'brain-fingerprinting') for solving crimes. The technology works by detecting brainwaves that indicate whether or not a person has specific knowledge of something. It's hoped eventually the technology could be applied to criminal cases especially pre-trial investigations as a way of eliminating possible suspects. But what of the ethical concerns ? Lynn Freeman talks to the director of clinical legal studies at Canterbury University, and project team leader, Professor Robin Palmer.