agent mark ludwick had been convinced of jason carter's guilt ever since that initial interrogation as after the murder. >> i'm telling you the truth. the god awful truth. i'm telling you the truth. >> you're not telling me the truth, jason. >> yes, i am. >> that day, jason agreed to take a polygraph exam. >> regarding the death of your mom, do you intend to answer each question truthfully? >> yes. >> did you physically hurt your mom last friday? >> no. >> he fell -- >> by a big margin? >> huge margin. >> so, he totally blew with the quality growth. ? >> he totally failed a polygraph. >> not evidence, but guidance. >> strong guidance, yes. >> in march 2019, the curtain came up on the criminal trial. it was first degree murder and jason carter pleaded not guilty. as much as he wanted his son to face justice, bill carter knew there would be no winners. >> i knew there wouldn't be a good outcome. >> why do you say that? >> if my son is guilty of first degree murder, that's not a good outcome. >> that's a bad choice? >> you'll hear prosecutors talk about motive, means and opportunity. wel