https://www.newsweek.com/man-taking-lie-detector-test-police-job-admits-having-child-porn-1780387
Another example of how the polygraph is used to get confessions. This guy would have never been busted if he did not make the confession during his poly.
EVERYONE, STOP MAKING CONFESSIONS IN THE POLYGRAPH! That is the only thing the polygraph does, it does not detect lies, it is just used to make you confess.