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Glass.Evidence

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Glass evidence powerpoint presentation. Forensics course.

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Glass.Evidence

  1. 1. Forensics<br />Glass: Locating, Collecting, Identifying, and Comparing Samples of Glass<br />10/12/2009<br />CJ 242 Brandon Webb/Justin Phillips<br />
  2. 2. Glass<br />Common to most localities<br />Composed of silicon/metal oxides<br />Sand is primary in ordinary glass<br />Soda-lime glass<br />Boronsilicates<br />
  3. 3. Glass - Types<br />Tempered<br />Rapid heating/cooling process<br />Side/rear windows on U.S. Autos <br />Laminated<br />Two sheets glass<br />Banded with plastic film<br />Windshields on U.S. Autos<br />
  4. 4. Glass Fractures: Radial<br />Crack in glass extending outward, similar to spoke of a wheel at point of impact.<br />Radial fractures for right angles on reverse side of force.<br />
  5. 5. Glass Fractures: Concentric<br />Cracks in glass forming rough circle around point of impact.<br />
  6. 6. Glass Fractures<br />Investigators can/may determine:<br />Force<br />Velocity<br />Direction of impact<br />Object causing fracture<br />
  7. 7. Collecting Glass<br />Must be thorough<br />Aware of transference<br />Must obtains samples for comparison<br />Use paper when packaging!<br />Sealable containers, large pieces<br />
  8. 8. Identify/compare fragments<br />Can place suspect at scene of crime<br />Variety of tests<br />Not all tests performed<br />Comparing two samples<br />Determine if from same/different sources<br />
  9. 9. Forensic analysis – case study<br />National Institute of Justice, 2003<br />Miami Dade Police Department – Crime Laboratory<br />Dr. Jose Almirall<br />Felony Hit and Run – Caribbean Islands<br />Refractive Index (RI)<br />ICP-AES<br />Samples indistinguishable to one another<br />Case resulted in plea agreement<br />

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