Medium Velocity Impact Blood Spatter Analysis

Blood spatter analysts analyse the blood stains on all types of surfaces present in the crime scene to reconstruct the events that would have led to the crime. This paper on blood spatter analysis focuses on the uniqueness of various types of impact blood spatters caused by different objects which can be potential weapons. Different objects with varying mass, density, size, shape, angle of strike and the strike velocity leads to differing momentum which leads to varying impacts. These varying impact forces lead to different shape of droplets in the blood spatter. In this experiment conducted, differing spatters formed by a cricket bat, a rock, a metal rod and a knife have been studied and analysed, and only the weapon characteristics were taken as parameters; the blood tissue or the area of impact on the body and other things were invariant and haven’t been studied in detail. The bat created the maximum impact spatter, followed by the metal rod, the rock and the knife. It was concluded that the higher impact of the object reduces the size of the droplet and increases their spatter density. The fake blood might not have the exact characteristics as of the real blood, but the experimental conclusions can help in interpreting real blood stain patterns better.

Author(s): Gayathri Shibu and Suneetha V

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