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Blood Analysis

Blood Analysis. Forensic Science 4/2/14. Drill. True or False – correct if False ABO blood types are considered individual evidence. Serology is the study of blood . The precipitin test is used to determine if a red stain is blood.

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Blood Analysis

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  1. Blood Analysis Forensic Science 4/2/14

  2. Drill • True or False – correct if False • ABO blood types are considered individual evidence. • Serology is the study of blood. • The precipitin test is used to determine if a red stain is blood. • Blood spatter is caused by a blood source coming in direct contact with an object. • HW: • Study for Blood Quiz (on the Blood Basics notes and ABO genetics) • Blood Species Questions (if needed—probably not)

  3. Objectives • IWBAT • Determine the ABO genetics for different parent/child combinations. • Identify similarities and differences between different blood species.

  4. Agenda • Drill • Finish Notes • Blood Species Questions • ABO Genetics WS • Closure

  5. Blood Splatter Analysis —Directionality The shape of an individual drop of blood provides clues to the direction from where the blood originated. How will the point of impact compare with the rest of a blood pattern? Forensic Science: Fundamentals & Investigations, Chapter 8

  6. Determining direction of travel

  7. Determining angle of impact length width http://www.howstuffworks.com/bloodstain-pattern-analysis3.htm

  8. Determining the source

  9. Blood Splatter Analysis Lines of convergence—two or blood splatters can pinpoint the location of the blood source Forensic Science: Fundamentals & Investigations, Chapter 8

  10. Determining the source Area of convergence

  11. Blood Splatter Analysis—Six Patterns Describe each of these: • Passive drops • Arterial gushes • Splashes • Smears • Trails • Pools Forensic Science: Fundamentals & Investigations, Chapter 8

  12. Blood Splatter Analysis—Impact Patterns can help investigators determine the type of weapon used • What kind of a pattern is produced by a gun shot? • What kind of a pattern is produced by a hammer blow? Forensic Science: Fundamentals & Investigations, Chapter 8

  13. Crime Scene Investigation of Blood • Search for blood evidence • Determine • Is the evidence blood? • Is the blood human? • What is the blood type? • Interpret the findings: • Does the blood type match a suspect’s blood? • If not, exclude that suspect • If yes, decide if DNA profiling is necessary Forensic Science: Fundamentals & Investigations, Chapter 8

  14. Blood related songs • Mammal • The Bloodmobile • Both by They Might Be Giants

  15. Species QuestionsABO Genetics Practice • Find the sketches you made of the various species of animal blood. Answer the questions on a sheet of notebook paper. • Chicken blood = Bird blood • When done, pick up the ABO Genetics practice worksheet • We will review both in 15 minutes.

  16. Closure • Write a series of characteristics to differentiate between mammal and non-mammal blood.

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