BPA 3
- Created by: meganjayne15
- Created on: 30-04-14 13:27
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- BPA
- Manual stringing
- advantages
- cheap
- easy
- works with limited data
- provides a direct illustration
- disadvantages
- time consuming
- strings and pins, clamps and stands are used for manual back-extrapolation to locate origin
- choose stains close to point of origin
- choose the larger stains present
- advantages
- computer software - stringing
- backtrack or hemospat
- advantages
- quick to perform
- applicable to most crime scenes
- accurate results from control experiments
- results can be viewed from any perspective
- Determining point of origin
- once directionality is determined, a point of convergence can be determined
- Angle of Impact (AOI)
- width/length = sin AOI
- Documentation
- written notes
- avoid the term "bloodstain" until confirmed
- details of any presumptive tests
- colour, size, shape and location of stain
- stain wet or dry?
- environmental conditions
- stain wet or dry?
- avoid the term "bloodstain" until confirmed
- sketches
- used to complement photographs
- give better overall perspective
- include only essential items
- useful for clothing
- photographs
- best way to document bloodstain patterns
- overview, approach and close up photos
- use labels, arrows, numbered markers, scales
- best way to document bloodstain patterns
- written notes
- Conclusions
- many benefits to BPA in terms of event reconstruction
- gives indication of nature of offence, the sequence of events
- dependant on accurate records from scene
- open to debate
- continually evolving science in order to prove hypotheses
- gives indication of nature of offence, the sequence of events
- many benefits to BPA in terms of event reconstruction
- Manual stringing
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