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Contact Traces: Blood

Contact Traces: Blood. Contact Traces: Blood. Serology: The study of blood and other liquids in forensics. Taking a sample of blood off the car windscreen. What is Blood?. Makes up 9% of a person’s body weight. T he average adult has about 5 to 6 litres of blood in their body.

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Contact Traces: Blood

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  1. Contact Traces: Blood

  2. Contact Traces: Blood • Serology: The study of blood and other liquids in forensics. Taking a sample of blood off the car windscreen

  3. What is Blood? • Makes up 9% of a person’s body weight. • The average adult has about 5 to 6 litres of blood in their body.

  4. Blood and Crime • Common evidence in violent crimes What kind of violence would lead to blood traces? http://www.staffs.ac.uk/schools/sciences/forensic/forensicfacilities/photography.jpg

  5. Blood and Crime • Difficult to remove from a crime scene which makes it very incriminating evidence

  6. Blood and Crime • Tests for blood are so sensitive that they can show up blood that isn’t visible to the eye. A trail of latent blood made visible with the use of a reagent called luminol

  7. Blood Groups • Discovered by Karl Lansteiner in 1901. • Four blood groups How is this useful in forensic science?

  8. Blood Groups • Percentage of ABO blood group types in Australia

  9. Blood Groups • Further categorized based on another antigen discovered by Dr Landsteiner in 1927.

  10. Blood Groups • Blood groups are inherited from your parents • Only the dominant group is expressed

  11. Blood Spatter: Prac this week • Examination of blood splashes and smears at a crime scene tell a story (click below for video)

  12. Blood splatter analysis Dexter (click below for video)exterDe

  13. Bloodstain patterns • Passive Bloodstains are caused by the force of gravity

  14. Bloodstain patterns • Projected Bloodstains occur when some sort of energy or force has been transferred to the blood source.

  15. Bloodstain patterns • Transfer/Contact bloodstains occur when a bloody object comes into contact with another object.

  16. Blood splatter analysis • http://www.youtube.com/watch?v=2UV_moaF45I

  17. Determining Angle of Impact

  18. DNA: Deoxyribonucleic Acid

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