The biggest lie I've ever heard is that polygraph tests are psychometrically valid. I'm sorry, that's just a personal peeve of mine :grumpy:
I agree, lie detectors tests are a giant pile of voodoo piled on top of a tiny sliver of science. Totally worthless.
Speaking of lie detectors, one of my favorite scenes from one of my favorite shows of all time (The Wire): YouTube Baltimore Police Homicide investigation-FUNNY