At this point, I assume the point of the process isn't to ferret out liars, but to ferret out people who were trained to pass a polygraph under stress, on the t

At this point, I assume the point of the process isn't to ferret out liars, but to ferret out people who were trained to pass a polygraph under stress, on the theory that such people are more likely to be spies. It's the only thing that makes sense given the scientific unreliability, the random unfounded accusations by interviewers and whatnot. But maybe I'm being to generous.