Does the FBI even administer lie detector tests? They are inadmissible in court, so I’m not sure why they’d bother.
In retrospect we think what crossed him up was the question: "Have you ever been in trouble with the police". He answered "No"
But he told me he was thinking of a prank on Halloween, the cops were called, he was questioned and let go. He was 16 at the time and was a bit shaken up, at the time, by the whole thing.