Examinee says he shouldn't have failed-- then evidence arrives that supports the fail

One roommate wanted another tested. Roommate had a large amount of cash stolen from two different places in his bedroom the same week. Roommate B denied taking it. During a polygraph exam, Roommate B had very large responses on all relevant questions on all of the many charts conducted, indicating DI (fail).

Later, when rent was paid, Roommate B was said to have paid using marked currency from the thefts.