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A Blind Trial Evaluation of a Crime Scene Methodology for Deducing Impact Velocity and Droplet Size from Circular Bloodstains
- Source :
- Journal of Forensic Sciences. 52:65-69
- Publication Year :
- 2007
- Publisher :
- Wiley, 2007.
-
Abstract
- In a previous study, mechanical engineering models were utilized to deduce impact velocity and droplet volume of circular bloodstains by measuring stain diameter and counting spines radiating from their outer edge. A blind trial study was subsequently undertaken to evaluate the accuracy of this technique, using an applied, crime scene methodology. Calculations from bloodstains produced on paper, drywall, and wood were used to derive surface-specific equations to predict 39 unknown mock crime scene bloodstains created over a range of impact velocities (2.2-5.7 m/sec) and droplet volumes (12-45 microL). Strong correlations were found between expected and observed results, with correlation coefficients ranging between 0.83 and 0.99. The 95% confidence limit associated with predictions of impact velocity and droplet volume was calculated for paper (0.28 m/sec, 1.7 microL), drywall (0.37 m/sec, 1.7 microL), and wood (0.65 m/sec, 5.2 microL).
- Subjects :
- Paper
Surface Properties
Trial study
Physics
Mathematical analysis
Analytical chemistry
Models, Biological
Wood
Pathology and Forensic Medicine
Physical Phenomena
Impact velocity
Blood Stains
Calibration
Genetics
Range (statistics)
Humans
Crime scene
Droplet size
Bloodstain pattern analysis
Mathematics
Subjects
Details
- ISSN :
- 15564029 and 00221198
- Volume :
- 52
- Database :
- OpenAIRE
- Journal :
- Journal of Forensic Sciences
- Accession number :
- edsair.doi.dedup.....a962be561e52b816bc11855d82fbff01