BPA MOCD 2

Created by: meganjayne15
Created on: 03-05-14 15:02

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BPA (MOCD) 2
- transfer
- evidence recording
  - 1. Establish main areas of interest
  - 2. sketch area of interest
  - 3. assess pattern type
  - 4. take photographs and notes
  - 5. Ensure that all dark surfaces are examined - may be non-visible blood present - consider lighting and or chemical enhancement
- on garments
  - identify type of stain
  - identify the patterns of staining
    - can the patterns be reproduced?
  - Consider circumstances or available information about incident
  - support or refute any statements
  - considerations
    - fabric absorbs blood at different rates
    - movement of wearer
    - blood deposited at other time than the incident
    - washing garment
- active
  - composite stains
    - complex
      - blood into blood
  - arterial damage
    - breach sites (table on revision pics)
    - influenced by
      - location of artery
      - severity of injury
      - surface orientation
      - nature of target surface
      - medical intervention
  - cast-off
    - types
      - swing cast off
        minimum number of blows
        
        end of swing
        
        swinging action
      - in line staining
      - cessation cast off
        ?Momentum transfer
      - percussive staining
        "feathering"
  - impact spatter
    - Blood projected and dispersed by forces, other than gravity, acting on a source of blood
      - misinterpretation of impact spatter
        expirated blood
        
        secondary spatter
        
        cast off
      - variables
        shape of weapon
        
        weight and length of weapon
        
        number of impacts
        
        amount and direction of force applied
        
        location of sites of injury
        
        amount of blood
- passive
  - single drops
    - free falling
      - large drops travel further than small drops
    - gravity vs friction
    - volume determined by source
    - resulting stain determined by:
      - nature of target surface
        spines
        
        secondary spatter
      - surface angle
      - distance dropped
      - drop volume
  - large volume
    - scene information
      - minimum time
      - number of scenes
      - speed of blood loss
  - PABS
    - physiological change
      - other body fluids present
      - evidence of cleaning up

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BPA MOCD 2

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