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Another federal or state or local law enforcement job in the future. given the fbi's success administering its own polygraph, and i've asked this of mr. comey as well, will you commit to provide guidance or share best practices with cbp and dhs to better conduct their polygraph examination? >> well, senator, that's not an issue that i'm especially familiar with at this stage. but something i would look forward to learning more about and seeing how we at the bureau could be helpful to cbp in that regard. >> that would be helpful. the fbi, we understand, has a much better program there. and it i...

Polygraph examination came back inconclusive, which could have went either way. you know, that was a red flag and we just weren't sure. >> boone says chris woodson claimed that the morning of the murder he'd been paying college fees and played racquetball too before going to engineering class. was he telling the truth? still suspicious but not enough to take him in? >> right. >> but the morgan family was convinced that kenny boone had, in fact, found the murderer, chris woodson. >> when you heard that it was a murder, did your mind go to suspicions? >> exactly. >> yes. >> my mind went right to...

For me, denial was the best way to survive. >> we all tell ourselves little lies, and sometimes big lies, to make ourselves feel more comfortable, and certainly when our survival is at stake, i mean, you can change your perception of things. >> this made her polygraph test useless. >> if she doesn't know in her own mind what is truth and what is fiction, how can she possibly react properly to a polygraph examination? >> there is a reason, and a very good reason that polygraph examinations are not admissible in courts of law. in this incident, tom brown passed the polygraph. and in this instanc...

Site was compromised. >> somebody's been there, moving things around, and it just makes the investigation a lot more difficult. >> in the meantime, it didn't take long for investigators to eliminate julie's husband as a suspect. >> when he was perfectly willing to take a polygraph examination, kept in contact with the officers trying to work this case, i think all suspicion was erased. >> but julie's autopsy did provide some important information about the killer. the medical examiner found evidence of sexual assault. a rape test kit recovered biological evidence, presumably of the perpetrator...

Exclude him. >> but like curtis pope, he, too, passed a polygraph examination. >> the polygraph is just a tool. it's not 100% reliable. that's why it's not admissible in court. >> if it hadn't have rained, maybe we could have gotten fingerprints. but you can't focus on what you could have had. you got to find what you do have. >> investigators needed forensic evidence to solve this crime and hoped to find some of it at the scene.