Ashley Bekondo - Chapter 4 Guided Notes Fibers - Name_Period_Date Chapter 4 Fibers Guided Notes Sheet I II III IV Introduction A Fibers are used in

Ashley Bekondo - Chapter 4 Guided Notes Fibers -...

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Name:________________________________________________________Period:_______Date:________ Chapter 4- Fibers Guided Notes Sheet I. Introduction A. Fibers are used in forensic science to ______create a link between crime and suspect___________________________ B. Fibers are a form of ____trace__________ evidence because 1. Direct transfer is_______passes from victim to suspect__________ 2. Secondary transfer is____from source (i.e carpet) to suspect to victim__________ II. How Forensic Scientists Use Fibers A. Questions asked by the investigator about fibers a) Type of fiber b) Fiber ___color______________ c) ___Possibility of violence______________ d) Where the fiber was found e) Textile the fiber originates from f) Multiple fiber transfers g) Type of crime committed h) Time between crime and discovery of fiber i) Location of suspects III. Sampling and Testing A. Fiber evidence is collected with 1. Special vacuums 2. Sticky tape 3. forceps B. Microscopes reveal 1. Shedding - common form of fiber transfer 2. Polarizing microscope: uses special filters to determine the type of fiber 3. Infrared spectroscopy reveals chemical structures to differentiate similar fibers C. Destructive Testing Methods 1.
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