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Trumbo, Will Y.K. “Scientific Approaches to Bloodstain Analysis.” Academia…
Trumbo, Will Y.K. “Scientific Approaches to Bloodstain Analysis.” Academia.edu, https://www.academia.edu/3751908/Scientific_Approaches_to_Bloodstain_Analysis.
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Methodology
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Case Study
This case contains 1 rape, 1 rape with murder, and a murder.
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Blood was in various places: small amounts on the wall, large amount in bedroom, and a large amount on the floor.
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Results
Low Velocity
Spatter patterns conclude that it is usually either stabbing or blunt force trauma. The impact is less then 5 ft/sec. The patterns are large and irregular in size and shape. The diameter ranges from 4 mm to 8 mm.
Medium Velocity
Impact is usually greater than 5 ft/sec to 25 ft/sec. The diameter is usually 1 mm to 4 mm. This velocity typically caused by sharp blunt force trauma. Medium velocity tends to create an arterial spurt.
High Velocity
Typically blood misting from a gun shot wound. The impact is in the excess of 100 ft/sec. The diameter is less than 1 mm. It typically travels shorter distances because of high air resistance.
Introduction
Thesis focuses on physical properties of blood, velocities of blood spatter, theory of blood spatter, angle of impact determination, and the documentation of bloodstain at the scene.
The location, size, shape, and distribution of blood can help with reconstruction.
Detailed analysis of all of this can provide type of velocity used, number of blows inflicted, position and movement of individuals, types of injuries, time, and which wound was inflicted first.
Bloodstain analysis is based on biology, chemistry, physics, and mathematics.
Hypotheses
Hypothesis 1: Calculating the angle of impact of blood droplets yields conclusive findings about origination of blood.
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Abstract
Forensic Science, also known as Forensics, is the scientific processing of information found at a crime scene.
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