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Bloodstain Patterns In Crime Scene Investigation

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There are many important factors in crime scene investigation, one of those involves serology and observing the blood spatters at a crime scene. Many steps are taken when dealing with blood at a crime scene, some of which are if the substance is actually blood, blood typing, discerning the origin of the blood, the direction of travel of the bloodstain, what weapon would have caused the bloodstain, etc. Serology and dealing with bloodstains can be a very difficult task for criminalists because blood also deals with DNA, what type of blood it is, identifying who the blood belongs to, what caused the bloodstain, and what direction it originated from. To understand serology, it is probably best for one to understand the nature of blood first. …show more content…

Carefully and thoroughly analyzing the significance of the position and shape of blood patterns along with their origin and trajectory is very important in an investigation. The process is sufficiently complex and should only be done by an examiner who is experienced in such determinations. The interpretation of bloodstain patterns is the most important of all and requires carefully planned control experiments that use surface materials comparable to those found at a crime …show more content…

There are many steps criminalists must take if they find a bloodstain at the crime scene such as first identifying if it is blood, measuring the bloodstain, analyzing it, testing it and many other steps. By observing blood spatters and their characteristics, criminalists can discern what weapon was used, the origin and direction of travel of the blood spatter, the velocity of the spatter, how many times was hit or shot, etc. Examining and observing bloodstains or spatters is extremely important when there is no body at a crime scene. But in order to understand bloodstains, one should first know about the nature of

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We came to this conclusion not after our recordings of our observation, we also added drops of various indicators to each substance sample. By doing this, we were able to see the various reactions with each indicator to see which substance matched the reactions of the unknown substance found at the crime scene. The substance at the crime scene reacted with bubbling when each indicator, as did the Acetylsalicylic Acid, confirming the identity of the substance At the crime scene we also found a series of blood spatters as well as a pool of blood near Anna’s head. Not only did the blood provide us with DNA evidence, we were able to conduct a series of tests allowing us to figure out whether Anna fell and started bleeding or was already on the

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There are different ways that prints can be developed in crime labs; by the use of traditional powders, fluorescent powders, chemicals, and superglue. They can be viewed under laser and UV lighting. When the finger print analysis was done on the magazine, Christopher Vaughn’s fingerprints did not show

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Englert explained that high velocity blood splatter is blood that has been hit by something at rapid speed. For example, a bullet which was used in the murders of Kim Camm, and her children. According to Englert, the bloodstains on the shirt, socks, and shoe collected from the defendant were a result of high velocity impact spatter. Rod Englert testified that this was an indication that the defendant was “within four feet of the shots when they were fired” (Mckay, 2002). However, the defense argued that the bloodstains found on the items belong to David Camm were merely the results of transfer.

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The Death of Anna Grace From the outside anna Garcia's house looks like any other house, but after looking closer we find a crime scene. The deceased body of Anna Garcia was found face-down in the hallway of her home. Pills, a tipped over chair, news paper, and a cup were found Many questions were raised what happened,who did it, and when. But the most important is how, how did Anna die.

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The blood found at the crime scene belonged

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The morning of February 24, 2005, the grandmother of 9yr. old Jessica Lunsford called the police in Citrus County, Fla., to report her granddaughter had disappeared from her room the night before. She had tucked her into bed. The only thing that was missing was a stuffed animal that her father won for her at the county fair. Immediately police began to search for Jessica.

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Spattered blood is a random distribution of bloodstains that vary in size that may be produced by many mechanisms. The size and quantity of spatters produced by a single mechanism vary significantly. The amount of available blood and the amount of force applied to the blood affect the size range of spatters. Spatter is created when sufficient force is available to overcome the surface tension of the blood. The amount of force applied to a source of blood and the size of the resulting spatter vary considerably with gunshot, beating and stabbing events.

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A blood spatter proved in a case study that a teen could not have murdered her parents. In a murder case where an 18-year-old, Sarah Johnson was sentenced to life in prison for committing a first degree murder for both her and dad. The case reopened when a retired crime lab technician Michael Howard “testified that whoever shot Diane and Alan Johnson at close range on September 2, 2003, would have been hit by a "rain" of blood spatter” (http://www.cnn.com/2005/LAW/03/03/johnson/index.html?eref=sitesearch). Howard came up with his theories proving that, Sarah was not even close in committing those murders and it is a wrongful conviction. Based on blood spatter, Howard disclosed that the shooting which took place was at a very close range and

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Have you ever wonder how does a crime scene investigator, known as a CSI, discover blood spatter on different fabrics, which is not visible to the human eye? The key is bluestar. According to the article “Influence of Bluestar Reagent on Blood Spatter Stain of Different Fabrics” by Arnon Grafit, bluestar is a “luminol-based reagent that is applied by spraying on surface.” Not only that, but “it helps obtain DNA and to analyze spatters patterns. By analyzing the article the reader is able to understand how bluestar works through the rhetorical techniques used.

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If a lot of blood was lost, the blood droplets will be quite large. Detectives use this information when determining whether a person died or not. The shape of the blood stain depends on the angle of the blood when it hit the surface and the speed at which the blood drop was travelling. A droplet that has fallen vertically will be more round than a droplet that has hit the surface at an angle which will be oblong shaped.

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Doing this, helpws protect the evidence and prevent cross contamination. The crime scene is the physical area where a crime is thought to of occurred and where the evidence of the said crime is thought to reside. Vital evidence to a case, can be found at a crime scene. This includes, fingerprints, DNA, foot prints, bullets, bullet casings, fibers, etc. It is important to determine if a crime has in fact been committed, if so, the officer must initiate enforcement action, by arresting or pursuing the offender or dispatching apprehension information.

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Science has come a long way over the years. It has helped countless every day struggles and cure diseases most commonly found. What you don’t hear about however is the advancement of forensic science. Forensic science has helped solve countless cases of murder, rape, and sexual assault. In the case of John Joubert, it helped solve the murders of three young boys with one small piece of evidence that linked him directly to the crime.

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A number of criminal movies increases every year. There are dozens of films and videos where actors investigate various murders and catch criminals. After watching 21st episode of the seventh season of the "CSI: Crime Scene Investigation”, I understand that not every case can be solved easily. Unfortunately, I have seen some cases on TV where suspects have not been arrested even though they were guilty. In such cases, FBI agents begin to build their own idea of crime and even put it in the place of crime to think what they would do in the same situation.

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“Bloodstain Pattern Analysis: is the examination of the shapes, locations, and distribution of patterns of bloodstains, in order to provide an interpretation of the physical events that gave rise to their origin.” (Bloodstains.) Blood spatter usually doesn’t even use blood. The job of a blood spatter analysis is like a CSI’s job combined with a lot more blood. I chose this career because I love forensics.

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The creation of Blood Spatter Analyst has changed the perspective all crime scenes which are intensely solved in a completely new direction. It is the examination of shapes, distribution patterns and location of the bloodstain in order to find the real image which was created in the crime scene. All bloodstains and bloodstain patterns are evaluated by the force they were originally created. ( http://www.bloodspatter.com/bloodstain-tutorial). There has been a vast change and growing environment for the bloodstain spatters as there work now is recognized and appreciated within the law enforcement and the court officials.

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