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NCJRS Abstract

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  NCJ Number: NCJ 241744   Add to Shopping cart   Find in a Library
  Title: Quantitative Analysis of High Velocity Bloodstain Patterns
  Document URL: PDF 
  Author(s): William Ristenpart ; Fred Tulleners ; Sonya Siu ; Jennifer Saifi ; Faye Springer
  Date Published: 2013
  Page Count: 102
  Annotation: This study developed a set of statistically significant classifications of blood spatter patterns resulting from interactions between the victim, the suspect, and the weapon.
  Abstract: This study on efforts to develop a set of statistically significant classifications of blood spatter patterns resulted in two key findings: quantitative metrics involving the spatially-dependent size distribution of droplets within a spatter pattern could serve as an objective means of differentiating gunshot and blunt instrument spatter patterns; and the double blind investigation revealed that human assessments yielded low error rates for gunshot spatter patterns, but very high error rates for blunt instrument spatter patterns, 0.2 percent and 37 percent, respectively. Data for the study were obtained by videotaping simulated bloodshedding events using various blunt instruments, and recording the spatter drop size distribution and morphology of different caliber bullets from various distances to the target surface. Photographs of blood spatter patterns from both blunt instruments and guns were produced and then assessed by trained analysts. The goal of the assessment was twofold: provide a set of quantitative error rates and test objective criteria for the classification of medium and high velocity bloodstain patterns. The findings from the analyst’s observations suggest that caution should be used when attempting to identify a blood spatter pattern resulting from either a gunshot or blunt instrument impact in the absence of secondary indicia. The findings also suggest the need for further development and refinement of quantitative image analysis procedures based on blood droplet spatial distributions. Implications for policy and practice are discussed. Figures, tables, references, and addenda
  Main Term(s): Blood stains
  Index Term(s): Evidence identification and analysis ; Evidence ; Forensics/Forensic Sciences ; NIJ final report ; NIJ grant-related documents
  Sponsoring Agency: National Institute of Justice (NIJ)
US Department of Justice
Office of Justice Programs
United States of America
  Grant Number: 2010-DN-BX-K039
  Sale Source: NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
  Type: Report (Technical)
  Country: United States of America
  Language: English
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