Could you tell people something like "If you did intend to lie on the polygraph test, you should by no means tell anyone that, including me"? Or would that be t

Could you tell people something like "If you did intend to lie on the polygraph test, you should by no means tell anyone that, including me"? Or would that be too legally risky. It seems like otherwise you have something of a moral quandry. The lie detector is ineffective, so without instruction in countermeasures, a person guilty of one thing could still end up accused of another based on their performance. Whatever they're actually guilty of, that scenario is negative utility for everyone.