tambasco took a small sample from the vehicle.looked similar to the carpet in margie's parents house. but under a microscope, the fibers told a different story and were similar in all respects to the fibers found on margie's clothing. >> we looked at color. you can see the color is the same. we looked at diameter. you can see the diameter is consistent. we looked at the trilobal design, and the pattern does show that. >> chemical tests revealed that both sets of fibers had been dyed with the same chemicals. but dye evidence is not definitive. >> the presence of the fibers being consistent with the fibers in the vehicle is not identification to the exclusion of all others. it is not absolute. there's no way anyone can come to court and testify that fiber came from that carpet. it's just not going to happen. >> but even more damning evidence for officer oswalt would come from margie's 6-year-old son, brandon. ♪ go! go! go! he's challenging the very fabric of society. in a post cannonball world! was it grilled cheese? guilty! the aqu