Forensics - marks & impressions

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  • Created by: Ashlee
  • Created on: 01-05-15 17:34
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  • Tool marks and impressions
    • characteristics
      • class
      • individual
      • striations on surface of tool
    • types of marks
      • static/ compression/ indented
        • pressed into soft material
      • dynamic/ grinding/ sliding
        • slide across surface leaving striations
      • cutting toolmarks
        • combination of compression and sliding marks as it indents material
      • multistroke
        • repetitive action
    • recovery
      • torch
      • photography
      • recover whole item
      • casting
    • examination
      • visual
      • unique characteristics due to manufacture and use
      • examine tool first then compare to crime scene
        • reduce cognitive bias
      • test marks
        • same tool
        • malleable material
        • angle of incidence
        • striations
      • trace evidence
      • recent contact
      • deposits of surface paint
      • counter marks
    • evidential value
      • probative value?
      • useful in case?
      • useful for intelligence?
      • other evidence types from tools?
    • other marks
      • firearms
      • gloves
      • bites
      • on bones
      • crashes
      • tyre impressions

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