Point Area of Origin - The common point area in three-dimensional space to which the trajectories of several blood drops can be retraced. The aim of the investigation is to examine the dependence between the blood pressure and the hour.
After a review of the evidence by Paul Kish, another bloodstain pattern analyst, Laber reviewed the report submitted by Kish and revised his findings to include the possibility that the blood came from expiration by Lovelien.
The idea of taxonomy is derived from biology where organisms are classified by shared characteristics of varying degrees that also share a hierarchical relationship. Often the scene is documented using multiple methods.
Close-up — images taken with a macro lens giving the greatest amount of detail. The terms used to describe bloodstain patterns, are oftentimes confusing to the average investigator.
References Bevel, T and Gardner R. Because of the large size of human body, blood is pumped from the heart to arteries under certain pressure enabling in filling The problem is "We have two opinions in this case.
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The point of convergence is the intersection of two bloodstain paths, where the stains come from opposite sides of the impact pattern.
Dynamic Stains Dynamic stains are created by forceful events where fluid blood is projected out from a source under some force or compression.
Nowadays, obesity is a big problem among mankind especially in well-developed countries. Stites testified for the prosecution that he was an expert blood spatter analyst.
Classification however, is but one step in the overall analysis. Moving down the hierarchy, the criteria become more and more refined and thus the conclusion about a classification becomes more distinct.
Bloodstain evidence can also show evidence of a struggle. Also how the blood was deposited such as dripping blood, spilled blood or blood, which has been projected. These type stains are usually associated with gunshot injuries. Saturation Patterns Saturation patterns occur when blood had been drawn into porous materials such as rugs, cloth, and clothing and usually tend to destroy other blood patterns of interest.
The size, shape, and number of resulting stains will depend, primarily, on the amount of force utilized to strike the blood source. Sometimes the object that wiped through the blood can be identified, for example a broom.
Since the z-axis is perpendicular to the floor, the area of origin has three dimensions and is a volume The term point of origin has also been accepted to mean the same thing.
The science of bloodstain pattern analysis applies scientific knowledge from other fields to solve practical problems. Wear eye protective and disposable infectious disease gown to protect clothing when exposed to large amounts of blood or other body fluids.
Furthermore an effective bloodstain pattern analysis can confirm or refute statements made by principals in the case. The reference to pattern analysis or pattern interpretation further confuses the issue because the word interpretation connotes subjectivity to the scientific analysis and evaluation of bloodstain pattern evidence.
Dispose of contaminated supplies as recommended in this protocol. Aside from the victim physically moving, skin is elastic and bones break. Forensic photography Crime scene photography has some unique requirements. Conditional Evidence is caused by an action or event, such as lighting conditions at a crime scene, odor, color, direction of smoke; flame color, direction, temperature ; location of evidence including bloodstain evidence in relation to the body.View Essay - Week 6 - Bloodstain Analysis from CMRJ at American Public University.
Select two types of bloodstains patterns discussed in the Bevel book and discuss what each can tell analysts. one can simply look at a %(8). bloodstain pattern analysis: classification of bloodstain spatter by velocity There are three basic categories of stain groups based on the concept that the size of the bloodstain compared with the amount of force propelling that bloodstain.
Currently little is known about the methods used by bloodstain pattern analysts to select bloodstains when determining the region of origin.
Fourteen analysts two sets of selection criteria were established, one for use when the impact pattern when using a manual method to determine the region. Start studying Chapter Learn vocabulary, terms, and more with flashcards, games, and other study tools.
Discuss the methods to determine the area of convergence and area of origin for impact spatter patterns. Two common methods of documenting bloodstain patterns are the grid method and the perimeter ruler method. Features. Bloodstain Pattern Analysis (BPA), Methods currently used include: The point of convergence is the intersection of two bloodstain paths, where the stains come from opposite sides of the impact pattern.
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Two methods that are used to determine the scale and size of bloodstain Essay Sample There are two methods that are used to determine the scale and size of bloodstain (Saferstein, ).
One of the methods that used is the grid method.Download