BPA MOCD 2

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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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