ch6fiber_powerpoint

ch6fiber_powerpoint - Chapter 6 Fibers “Wherever he steps...

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Unformatted text preview: Chapter 6: Fibers “Wherever he steps, whatever he touches, whatever he leaves even unconsciously, will serve as silent witness against him. Not only his fingerprints or his footprints, but his hair, the fibers from his clothes, the glass he breaks, the tool marks he leaves, the paint he scratches, the blood or semen he deposits or collects— all of these and more bear mute witness against him. This is evidence that does not forget.” —Paul L. Kirk (1902 – 1970)- Forensic scientist Chapter 6 2 Kendall/Hunt Publishing Company Fibers How fibers can be used as circumstantial evidence to link the victim, suspect, and crime scene. Why fibers are class evidence. Why statistics are important in determining the value of evidence. The student will learn: Students will learn: Chapter 6 3 Kendall/Hunt Publishing Company Fibers Distinguish and identify different types of fibers. Understand polymerization. Carry out an experiment in thin-layer chromatography. Judge the probative value of fiber evidence. Design and carry out scientific investigations. Use technology and mathematics to improve investigations and communications. Students will be able to: Chapter 6 4 Kendall/Hunt Publishing Company Fibers Are considered class evidence Have probative value Are common trace evidence at a crime scene Can be characterized based on comparison of both physical and chemical properties Chapter 6 5 Kendall/Hunt Publishing Company Fabric Fabric is made of fibers. Fibers are made of twisted filaments Types of fibers and fabric Natural —animal, vegetable or inorganic Artificial —synthesized or created from altered natural sources Chapter 6 6 Kendall/Hunt Publishing Company Types of Fibers Synthetic Rayon Nylon Acetate Acrylic Spandex Polyester Natural Silk Cotton Wool Mohair Cashmere Chapter 6 7 Kendall/Hunt Publishing Company Classification Natural fibers are classified according to their origin: Vegetable or cellulose Animal or protein Mineral Chapter 6...
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This note was uploaded on 02/25/2012 for the course FOR 100 taught by Professor Vincentlyons during the Spring '10 term at MO St. Louis.

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ch6fiber_powerpoint - Chapter 6 Fibers “Wherever he steps...

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