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And carla carlstorm. >> greg had not done well on a polygraph test. so they asked if he would take another test. so, he called a lawyer and 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 polygraph test, police get 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 t...

Cannot talk about this. >> shortly after, roger and pam took the polygraph tests and were told about the dismal results. they hired a lawyer. few in the family could understand why they would do a thing like that, if they were innocent, that is. >> i tried to say, what would i do if i was in their situation? i would do everything i could to help get these people that had caused such horror in their lives, and murdered kay. >> on the advice of their attorneys, roger and pam stop talking. and the lopsided rift in the family widened. from mistrust, to anger, to outright accusation. chris, the wom...

Nothing fazed her. >> question, had ben hired a key escort girl to tie him up? >> she snarked the idea and told them to turn it down. >> have compassion, please, have mercy. if there is an electrical chair and i am a suspect, give it to me right now. put me out of my misery. i want to die. >> shortly after 9 pm, detective carpentier brought up the idea of a lie detective test. >> i take 100 like detectors. i do whatever you want me to do. >> at this point i'm hoping that i am completely wrong. if she takes this polygraph tests, and she passes it, then i'm just going crazy my own head. there is...

Detectives bernie nelson and tony sharpton or hope that their collective experience would help crack two of the most horrific murder cases they had ever encountered. >> when you back up and look at what you've got, the scary fact is somebody is killing mothers and daughters, right? that's the commonality. >> yes and within close proximity of where the duets were found burned in the vehicle it was just two blocks away from where the often's were shot in their house. . >> the detective suspected they were dealing with the same murder and both cases, especially when they realized dolores the wit ...

I guess -- >> i don't think we have that. >> i think it all begins with the hiring process, and you've got to make sure that the background investigations that we do, the polygraph tests that we give, the deep dive into an individual's social media, the social media is also tremendously important to really determine, is this person suitable to be a police officer? and then, so, that's where it starts. >> reporter: so, you could see where the focus here is, not just from the capitol police department, these internal threats, but also the department of justice looking into domestic terrorism mor...