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This study sought to establish statistically significant classifications of blood spatter patterns resulting from the interactions between a weapon, suspect and victim. The study found that quantitative metrics involving the spatially dependent size distribution of droplets within a spatter pattern could be an objective means of differentiating the spatter patterns of gunshots and blunt instruments. Additionally, human assessments yielded low error-rates for gunshot spatter patterns (0.2 percent), but very high error rates for blunt instrument spatter patterns (37 percent). These findings strongly suggest that bloodstain pattern analysis experts should exercise great caution when identifying a pattern from a gunshot or blunt instrument impact in the absence of secondary indicia. Further efforts should be made to develop and refine quantitative image analysis procedures based on droplet spatial distributions.
 
 
Source: NIJ
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