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Suspicious and want to go at that person harder. >> greg may have lawyered up, but the detectives used the polygraph tests to turn up the pressure. >> they told your sister you failed a polygraph test. >> yes, they did. >> lots of people in town were turning in that direction. after the weeks sandi went missing, her dear friend vicky fulkerson thought greg was somehow involved. >> the police came to me and said things to me that think maybe he did. >> what did they tell you that made you suspect greg. >> well, he didn't pass test, people at a work party had heard them fighting, just enough, co...

That she believed that, that that is her honest recollection, that she is not being deceptive in that? >> yeah -- she is, she is clear. there is no misconception of her misidentifying who was in that room, correct. >> finally, we said earlier polygraphs are not always admissible in court or rarely admissible in court. they're used to dispute in the scientific community. to those who don't put weight in these findings what do you say? >> i'll never be able to convince anybody that does not believe in polygraph that it works. the only thing i can say is i conducted the polygraph test in the high...

>> roger and pam took a polygraph tests. and what do you know, roger was found to be deceptive. and pam was jumpy. the operator couldn't complete the task. but still roger and panned swore up-and-down brought they had nothing to do with it. they were victims himself. truth be told, the police needed some real evidence. when out of the blue, something arrived. >> investigators are confronted with new evidence and strange does not begin to describe it. someone saw the killing in a dream. coming up -- >> i have a photo lineup drawn up. and she puts her finger on it, she puts it right on roger's f...

Suspicion. so one last effort, they got a warrant. two warrants, actually. first, wallace and his partner went to pay a surprise visit to doug bradford's current house with a hidden microphone. they asked him about lynne's case. >> i would have guessed that was solved. i hadn't heard anything. >> no. we were wondering if we could have a few moments to see what you remember from back in '79. >> well, i've been advised by counsel not to have any further discussions about that case. >> oh, really? >> which was just the reaction that detectives expected. so they showed him their search warrant and...

>> the police actually said you failed the polygraph. >> i'm sure they did. >> so, you're disputing that. >> i am. it was inconclusive results on the polygraph. >> cops felt he failed it, and the results made them even more certain they were on the right track. king county prosecuting attorneys kristin richardson, and carla carlstorm. >> greg had not done well on a polygraph test. the lawyer said you need to stop talking to police right now, and so he did. >> must have been a big red flag for police. >> yes, i think it was. i think whenever someone flunks a polly -- polygraph test, police get ...