found white fibers, and there was a tiny spot of blood in the shower stall. andrew nardelli compared those fibers to fibers from rachel's sweater. >> one of the main types of characteristics that we would look for first off would be color, and a number of the fibers from the window were a different color than the types of fibers that were from the sweater. >> though superficially similar, the fibers did not match. investigators now compared the blood sample from the shower stall to rachel's dna and got another setback. >> with the swab from the shower stall, there was no dna detected. i ran the sample twice. i tried to concentrate the sample. however, it was a small, very weak blood swab, so no dna was detected from that swab. >> on denofa's hotel registration, he said he was