did. laura is joining me. tell me about the dna that according to the affidavit was found in the murder home. >> dna that was discovered came off of the sh sheath that came from the thick blade knife that investigators believe was used in the murders. it has a snap on the top, somehow the person left it behind, it is detailed as probable cause affidavit it was found lying next to the body of madison mogen on the bed, in a were able to detract dna from that, as we know. we're also later surveying the parents home. bryan kohberger's home in pennsylvania, they went through the trash, they were able to pull something out of there they were able to test and make a comparison