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FORENSIC SCIENCE

FORENSIC SCIENCE. Physical Evidence Unit Day One. You should have back…. Your 2 soil labs 6 stamped Getting Started entries. Today’s assignments:. Finish Fiber Source comparison chart from last week Go to tables 3 and 4 to finish Fiber Identification lab- solvent part

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FORENSIC SCIENCE

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  1. FORENSIC SCIENCE Physical Evidence Unit Day One

  2. You should have back… • Your 2 soil labs • 6 stamped Getting Started entries

  3. Today’s assignments: • Finish Fiber Source comparison chart from last week • Go to tables 3 and 4 to finish Fiber Identification lab- solvent part • All about Glass flipbook- instructions on front table • Glass Characteristics lab- paper on black cart in lab area

  4. PHYSICAL EVIDENCE: Journal 1 Answer on clean sheet of paper You can lead a jury to the truth but you can’t make them believe it. Physical evidence cannot be intimidated. It does not forget. It doesn’t get excited at the moment something is happening--like people do. It sits there and waits to be detected, preserved, evaluated and explained. This is what physical evidence is all about. In the course of the trial, defense and prosecuting attorneys may lie, witnesses may lie, the defendant certainly may lie. Even the judge may lie. Only the evidence never lies. --Herbert Leon MacDonell, The Evidence Never Lies What do you think physical evidence includes? How would it be presented to a jury? How important do you think it would be in a case?

  5. Criminalistics vs Criminology • Criminalistics is the scientific examination of physical evidence for legal purposes. • Criminology includes the psychological angle, studying the crime scene for motive, traits, and behavior that will help to interpret the evidence.

  6. 1923 Frye v. United States Scientific evidence is allowed into the courtroom if it was generally accepted by the scientific community. 1993 Daubert v. Dow Admissibility is determined by: Whether the theory or technique can be tested Whether the science has been offered for peer review Whether the rate of error is acceptable Whether the method at issue enjoys widespread acceptance. Whether the opinion is relevant to the issue Scientific Evidencein the Courtroom

  7. Probative Valueof Physical Evidence Legally, probative value is the level at which evidence provides proof of the crime. Associative value is used to place a suspect at a crime.

  8. What is glass? • Hard, brittle, amorphous substance • Composed of silicon oxides mixed with metal oxides • Main ingredient is sand

  9. What are the types of glass? • Soda-lime: used in plate & window glass, glass containers, light bulbs; contain Na, Ca, Mg & Al • Soda-lead: fine table glass & art objects • Borosilicate: heat-resistant like Pyrex & headlights; has BO2 added • Silica: used in chemical ware

  10. Types of glass • Tempered: used in side windows of cars: rapid cooling & heating makes glass stronger so that it fragments rather than splinters • Laminated: used in most windshields in US; 1 layer of plastic between 2 pieces of glass

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