It works the other way around: polygraphs need to show that they work in replicated, controlled experiments. That hasn't happened[1]. Lying is a complex behav

It works the other way around: polygraphs need to show that they work in replicated, controlled experiments. That hasn't happened[1]. Lying is a complex behavior. Like, really complex. Even with all of modern technology, we've only just started to detect far more gross brain functions: pre-speech motor patterns, fear responses, etc. It goes without saying that an MRI is at least slightly more complicated than something you could knock together in an afternoon after a shopping trip to Radio Shack in 1963. Polygraphs are a $2 billion industry, and Upton Sinclair said it best: "It is difficult to get a man to understand something, when his salary depends on his not understanding it." [1] https://en.wikipedia.org/wiki/Polygraph https://en.wikipedia.org/wiki/Polygraph