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True TV Fibers

Published on Nov 25, 2015

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1.

TRUE TV FIBERS

HALI GIERMANN
2.

FIBER EVIDENCE IS NOT UNIQUE

3.

LEADS

BUT IT CAN HELP LINK PEOPLE TO THE SCENE
4.

COLOR, MAKE AND SHAPE CAN HELP FIND WHERE THE FIBER CAME FROM

5.

Fibers are gathered at a crime scene with tweezers, tape, or a vacuum.

6.

WHERE FIBERS COME FROM

GENERALLY CLOTHING, DRAPERY, WIGS, CARPETING, FURNITURE, AND BLANKETS
7.

ORIGIN

DETERMINED TO BE NATURAL, MANUFACTURED, OR A MIX OF BOTH.
8.

NATURAL FIBERS

Natural fibers come from plants (cotton) or animals (wool).
9.

MANUFACTURED FIBERS

ARE synthetics like rayon, acetate, and polyester.
10.

EXAMINATION

  • A compound microscope or a spectrometer may be used to examine evidence
  • The micro-spectrophotometer is the best for examining fibers
11.

ANALYZING

  • compare color and diameter.
  • Dyes can also be further analyzed with chromatography,
  • looks for lengthwise striations or pits on a fiber's surface, or unusual shapes
12.

COMPARING

  • Whatever has been gathered from the crime scene is then compared against fibers from a suspect source
  • Fibers from car or home are laid side by side for visual inspection through a microscope

Hali Giermann