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Fiber Case

Published on Nov 25, 2015

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1.

Kristen Lea Harrison; 1982

  • Orange fibers were discovered on her body when she was found.
  • Years later, another woman was in a situation which led officers to a man's van
  • The man's van was similar to the van Kristen was forced into
  • It proved to have similar orange fiber carpeting
  • After tracing through the company the police arrowed it down to him.
Photo by dklimke
2.

WAYS TO COLLECT FIBER EVIDENCE

  • Use tape, tweezers, or a vacuum to pick up fibers
  • Usually in cases fibers come from clothing, wigs, carpeting, furniture, or blankets.
  • When alalyzing fibers, they are setermined to be natural, manufactured, or both.
Photo by WordRidden
3.

Types of Fibers

  • Natural: comes from plants (cotton) or animals (whool)
  • Manufactured: synthetic fabrics such as polyester.
  • Typically investigators have to do more research to match the correct type.
Photo by @notnixon
4.

Generics

  • Generic products are things with no "name-brand"
  • Usually made in mass production.
  • No uniqueness to an item unless its a malfunction
  • All fabrics are considered class evidence
  • NEVER should someone be convicted solely based off fabric! Unless theres DNA
Photo by Paul Jerry
5.

Types of Research

  • Many scientists use microscopes in order to see more detail
  • These details help the investigators narrow down the suspects
  • Even though there are similar fibers, by doing this you can narrow down.
  • The investigators then compare the fiber to suspects and evidence
  • In some cases they use a more complex microscope to see particles.
Photo by deqalb
6.

Comparing Fibers

  • Like earlier, fibers can NOT convict a person, but by comparing to suspects
  • It can narrow down the suspect pool in a few ways
  • 1) can discover who was with the victim ( suspects clothes fibers)
  • 2) can discover where the victim had been (carpet or drapes)
  • 3) can discover if the victim had bee there ( victim's clothing or DNA)
Photo by kellyhogaboom
7.

MICROSCOPES

  • Compound: uses light to reflect into lenses to manify to see smaller details
  • Comparison: two compond joined by optical bridge; used for precise identification
  • Phase-Contrast: reveals the structure of the fiber.
  • Scanning Electron: converts emitted electrons into a photographic image
Photo by Leo Reynolds
8.

OTHER HELPFUL TOOLS

  • Spectrometer: seperates light into wavlengths
  • created in 1859 by two German scientists
  • They discovered that in the spectrum, every element has its own individual section.
  • The scientists looking that his will see "absorbtion lines"
  • The specific wavelengths that are selectively absorbed into the substance.
Photo by Chris Fastie
9.

WRONGDOING IN WAYNE WILLIAM'S CASE

  • The carpet they are trying to math to is found all over the home, non unique
  • Room that doesn't have the carpet is where Williams just recently moved in
  • Assumed the fabric was unique to Williams case, whereas it so happens to be very popular.
  • Millions of pounds of the exact same fiber had been sold undyed to other products such as car mats.
  • They unfairly narrowed the region in which the suspect had to be from.
Photo by Leo Reynolds
10.

Wayne William's case

  • Wiliam's case was so clearly miss-handled that even the FBI and new investigators
  • Agreed that there was no possible way that Williams murdered Jones
  • And there was no fair reasoning to convict Williams based on one small GENERIC fiber.
Photo by cliff1066™

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