“Examples like this are one of the reasons I’ve never set much store in polygraph exams. It is largely ineffective on suspects who already have a criminal history and who may currently be involved in other crimes. They believe in their own warped minds that their crime was justified, or they were entitled to do it. Or, as several serial predators have told me over the years, if you can lie well to the police, how hard is it to lie to a box?”
