We all know that the polygraph, the infamous ‘lie-detection’ device, is not really capable of pinpointing a lie. It’s a tool that measures arousal, yes, but scrutinizing the lines and squiggles doesn’t necessarily lead to a point-blank assertion of falsity (or truth, for that matter). Simply said, It’s not really that useful, at least in terms of ascertaining truth. So what use is the polygraph? Here’s a whole journal article devoted to the answer:

// The Polygraph and Forensic Psychiatry