CNN Forensic Files July 16, 2014 06:48:00
A very unusual cross-section. they were also very brittle. >> they were brittle because of degradation due to age and exposure. the fibers were triangular in shape, or trilobal. using an infrared spectrometer, palenik discovered the fibers were polypropylene, a synthetic fiber used for carpeting. he then analyzed the fibers gathered from smithart's truck and clothing. >> we find in smithart's environment exactly the same kind of fibers. not only the same cross-sectional shape, but the same pigments used to color them. everything is there. >> the fibers in smithart's truck were manufactured by ...