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BRIDGEPORT, Mich. - Michigan State Police runs and operates seven crime labs throughout the state.Inside these labs, there are scientists examining evidence.Som

>> we saw some -- in the sink, so there's a good chance that he or she has washed their hands in some point, and possibly got the victims blood off their hands. >> the killer had also cut themselves, and the killer's blood was mixed with meghan's. there was no shortage of physical and formation left behind. >> you've got your killer indian a form, practically, you just do not know who he is. >> we had his touch dna, his blood and dna, his semen, we had his fingerprints. so, the so forensically, we had what we needed. it fell on the detectives, at

Owned by her second husband at the time of the murders. so it looks like the ex and her new husband are back in the mix when it comes to this investigation. your thoughts? >> it certainly does, but we still have to wonder what made law enforcement focus in on the suspect that they arrested. and i wonder about the tire that blocked the victim's progress. where did that come from? could that have come from that home? could it have had dna from one or more of these persons of interest, or suspects, in this case? you wouldn't think of that when you maybe changing a tire or handling it, if you had ...

Other day on o on one in three -- th 300 trillion. >> that a number we use in court to specify that this is the one and only person on earth who could have contributed to this dna. >> good lord in heaven. the only person on earth? ! that supplied that dna is the father of the killer? wow. so, my question -- >> well. nancy: my question, how will a whiley defense attorney think johnny cochran come in and try to crack the state's case, can be that done -- stay with us.

That lead them to life that bryan kohberger was connected to this crime. nancy: joining me right now special guest, a dna genius, cc moore. this is what i'm understanding out of all that, a blood bath at the scene, there may be more, i suspect there will be, one bit of dna that was found is in the snap on the sheath of that knife that foi folds over the knife. explain to me. how that correlates to dna found in the pennsylvania kohberger family home from the father. >> we don't know what type of dna was on that snap. it was most likely touched dna. they would have take than touched dna, might h...