Polygraph heart rate spike — Mark
During Mark Wadley's polygraph, his heart rate spiked when asked if he knew whether Joyce was still alive and when asked if he had been inside her car.
Where this was said
The Polygraph That Didn't Clear Mark
At 7:57 · chapter starts 7:40
Mark Wadley's polygraph results stopped short of clearing him. Examiners noted he was calm overall, but two questions produced notable heart rate spikes: whether he knew if Joyce was still alive, and whether he had been inside her car. Critically, the second question was framed around July 23rd — the day after Joyce disappeared — not the night of the 22nd. Brit immediately flagged this as significant: he could technically answer 'no' to the 23rd while still having been in the car on the night itself. The report's conclusion was explicit: Mark could not be eliminated as a suspect. [1] — Ashley Flowers "Mark Wadley's polygraph showed notable heart rate spikes on two questions: whether he knew if Joyce was still alive, and whether he had bee…" 07:35 Ashley contextualizes the date discrepancy by noting that early in the investigation, police had a witness — neighbor Dave Parks — who claimed to have seen Joyce leaving her apartment on the morning of July 23rd with two unrecognized long-haired men. That sighting, later doubted by investigators, appeared to have shaped the framing of the polygraph question.
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