I wasn't sure where this subject should go, but science seemed appropriate. If not, I'm hoping Ken will place it where it belongs. I've seen polygraph test used in different ways. For job interviews and issues, in our legal system, even parents having their children tested. Of course we always see it in TV shows, and the impression is that passing or failing the test is proof of guilt or innocence. What do you think? Do you believe the polygraph is a valid test?