BPA 1

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  • BPA
    • The evaluation of the static aftermath of bloodshed in an attempt to determine the actions that created the bloodstains found at the crime scene
      • physical evidence - who?
      • pattern evidence - what?
    • information from a crime scene
      • is it blood?
        • presumptive and confirmatory tests
          • LCV (leuco crystal violet)
            • retains print but can destroy DNA
          • luminol
            • does not retain print - disperses
      • whose blood is it?
        • DNA analysis
      • where is the blood?
        • detailed reports
      • how much blood?
        • type and severity of injury
      • relevance to crime?
    • information from analysis of BPA
      • nature of offence
        • weapon used?
      • location of sites of attack
      • number of blows
        • blood leaks out after a minimum of 3 blows
      • position of victim and assailant
      • sequence of events
      • presence of alien blood
        • blood that doesnt belong to victim
      • likelihood of blood on assailant
      • support for/refutation of alleged events
    • 1939 - Balthazard: length to width ratio, point of origin and surface type
    • Stain classification (Individual characteristics)
      • single drops
      • impact spatter
      • cast-off
      • arterial damage
      • large volume stains
      • Physologically altered bloodstains (PABS)
      • contact stains
      • composite stain patterns
    • reconstruction
      • garment analysis
        • put a mannequin to get a better understanding of the location of the stains on the garment
      • try to re-create the pattern which has been created at the crime scene
        • some techniques not accurate i.e. spatter head
      • re create an assualt
        • determine the different blood patterns after kicking and stomping

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