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Impressions

Impressions. Objective: bite marks. Do Now: Do you think bite marks are class or individual evidence?. Impressions. Impressions are created when… one object is pressed against another material with enough force to leave an impression or imprint of the object. Examples of Impressions.

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Impressions

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  1. Impressions

  2. Objective: bite marks Do Now: Do you think bite marks are class or individual evidence?

  3. Impressions • Impressions are created when… • one object is pressed against another materialwith enough force to leave an impression or imprint of the object.

  4. Examples of Impressions Bite Marks, shoeprints, tire tracks etc.

  5. Bite Marks • Individual evidence** • Investigators can analyze bite mark for the following: • Characteristicsof the teeth(position, evidence of dental work, wear patterns, etc.)

  6. Saliva or blood (DNA) When the bite occurred http://www.youtube.com/ watch?v=thfHB5e51q8

  7. Case Study: Ted Bundy Complete the case study on Ted Bundy.

  8. Computer Generated Overlays

  9. Closure: How did bite marks play a role in catching Bundy?

  10. Video case study: Ted Bundy http://www.youtube.com/watch?v=zriSw1UBqv8

  11. Objective: bite mark lab Do Now: What characteristics of bite marks can make them easily identifiable? Complete the bite mark lab

  12. Closure: What suspect was the killer in the case?

  13. Objective: Shoe prints Do Now: Are shoe prints class or individual evidence?

  14. Shoe Prints • Investigators can analyze a shoe print to determine its… • Class, or the type and brand of shoe

  15. Individual characteristics, such as wear patterns and specific damages or defects

  16. How to obtain shoeprints? Photograph Dusting (2-D print) Casting (3-D print)

  17. Case study: OJ and Shoeprints http://www.youtube.com/watch?v=kz1rrpoESa0 Complete O.J. Simpson shoeprint case study

  18. Answers to OJQuestions Class because his shoes were never found No matches in FBI database Answers will vary (opinion)

  19. Closure How did the shoeprint examiner determine the manufacturer of the shoeprint left at the scene?

  20. Objective: Shoe Prints Do Now: What characteristics could make shoe prints individual evidence?

  21. Objective: shoe print lab Complete shoe print lab

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