Shoe evidence: (1) shoe prints found at Bundy were from a size 12 Bruno Magli shoe, (2) bloody shoe impression on Bronco carpet is consistent with a Magli shoe, (3) Simpson wore a size 12 shoe.
I believe he did it, but lie detectors are not suitable for evidence IMO. They're fine as a tool to help LE decide where to steer an investigation in my mind, but no more.
There are ways to beat lie detectors as well (simple as clenching your rectum shut, as I understand it). They are bogus, and I guess can be used as a tool, like you say. But as evidence they are shady as shady gets.
They have pads you sit on now. I saw an episode on Mythbusters about them. None of them beat the test. One did beat this new MRI method they were trying.
I remembered when it happened and partially through the trial thinking that he had someone knock her off. There came a point where I was thinking there was no way he didn't do it himself.