Work-Related and Real-Life Based Project

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Work-Related and Real-Life Based Project

In cases involving bloodstain patterns, bloodstain pattern analysts must make their interpretations of bloodstain patterns at a crime scene based on scientific principles. Observations and interpretations are based on a general understanding of biology, physics, and mathematics.

You are called as an expert witness for the prosecution who wants to introduce your interpretation of bloodstain patterns found at a crime scene. The following types of bloodstain evidence were identified and documented:

  • The victim had evidence of petechial hemorrhage as a result of the attack.
  • There was evidence of sharp force trauma to the victim as evidenced by apparent stab wounds.
  • Other signs of trauma included lacerations to the head and apparent defensive wounds to the hand.

The prosecution needs you to articulate the following in regard to the various types of injuries sustained by the victim:

  • What could have caused those types of injuries?
  • Why was there minimal external blood found at the crime scene?

The prosecution also needs to prepare to rebut foreseeable defense motions. Discuss why bloodstain patterns are an accepted scientific discipline under both Frye and Daubert rules. Cite some case laws in your report.

The defense wants to argue that the victim was intoxicated and that the victim was attacking his client—the defendant—and that the injuries sustained were survivable if it were not for the victim's history of alcoholism. Prepare an argument on the effects of alcohol on bloodstains for the prosecution.

Prepare your answers in 1–3 pages, using the template provided

CSI Work-Related and Real-Life Based Project  Cause of: o o o Petechial hemorrhage Sharp force trauma Lacerations to the head and defensive wounds to the hand  Reasons for minimal external blood found at the crime scene:  Reasons for bloodstain patterns being an accepted scientific discipline under both Frye and Daubert rules:  Your argument on the effects of alcohol on bloodstains for the prosecution: Page 1 of 1 CRJ4015 Bloodstain Pattern Analysis © 2008 South University

Tutor Answer

School: UC Berkeley



Bloodstain Pattern Analysis.




Bloodstain Pattern Analysis
Blood pattern analysis is a scientific technique used interpret the bloodstain at the scene
of crime with the aim of recreating what could have caused the bloodshed. During blood pattern
analysis, the location is examined to determine the size of the blood, shape and distribution of the
bloodstain. Analyst uses the principles of biology that looks at the behavior of the blood,
mathematical concepts such as geometry, distance and angle and finally the concepts of physics
such as cohesion, velocity and capillary action.
Petechial hemorrhage
Petechial hemorrhage is a small red mark that appears on the on the eyes and crucial sign
of asphyxia. It is caused by obstructing the body airways externally. Petechial hemorrhage happens
when blood start leaking from small capillaries in the eyes. The capillaries veins raptures when the
pressure in head veins is increased due to the obstruction of the airways leaking blood into the eyes
and the skin. The presence petechial hemorrhage is an indicator the cause of death is asphyxia by
strangling. Petechial hemorrhage in the eyes and the eyelids are a strong indicator of murder by
hanging or strangling.
Sharp force trauma
Sharp force trauma occurs when tissues are separated by a sharp-edged object coming into with
the skin and the underlying tissues. Sharp force trauma exist due to injuries caused through
stabbing, slashing, incising and chopping. Sharp force trauma is caused by sharp objects coming
into contact with skin and tissues causing sharp force injuries to the tissues. The type of injuries
found on victim’s body indicate an attack by sharp-edged objects such as knif...

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Wow this is really good.... didn't expect it. Sweet!!!!

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