Blood Spatter Analyst Forensic science is a key aspect of Criminal Justice that helps rid the streets of lunatics and murderers. One of the most important fields of forensic science is blood spatter analysis. Under the Crime Scene Investigation, analysts gather the information that could eventually lead to a victim’s killer. Basic and complex information can be found when analyzing blood. We can learn what kind of weapon was used, the time of death of a victim and other important facts that can help a case. The pattern that the blood gives off give forensic scientists the tools that they need to help solve cases. Investigators can find clues from a murder through a number of different ways. Typically they find out how many times someone has been stabbed or however many blows they received. Through the count of the times the action had been performed they can come to an understanding of whatever hand the suspect was using. Other information can tell how the suspect was standing over their victim during the time of death. A common tool that forensic units use is the ultra violet or UV light. An ultra violet light can detect different areas that contain blood that might not be able to be seen in other conditions. Another common tool is the blood reagent test that forensics use on scene. These tests determine if the blood is human or animal. (Renee Blake) There are different types of bloodstain patterns that give a sense of what happened at the scene. The idea is to get a sort of background story from the random blood distribution. The different types of blood can tell us the method an assailant used such as passive blood stains. These stains are made from the drops off a weapon due to gravity. For instance, if an attacker w... ... middle of paper ... ...can-do spirit crime would almost be eliminated but only one can hope that people can make a change. Everything about analyzing blood seems like it is a suitable career to follow in. Although it isn’t for everyone, this job is demanding. This job needs people in order to help change the society we live in. Works Cited "What Is a Blood Spatter Analyst?" Criminal Justice Online. N.p., n.d. Web. 09 May 2014. . "Summary." U.S. Bureau of Labor Statistics. U.S. Bureau of Labor Statistics, n.d. Web. 09 May 2014. . “Blood Spatter Analysis-Youtube.” Blood Spatter Analysis-Youtube Renee Blake. N.p.,n.d. Web. 09 May 2014 .
Bloodstain Pattern Analysis is a forensic discipline which, among others, the position of victims can be determined at crime scenes on which blood has been shed. To determine where the blood source was, investigators use a straight-line approximation for the trajectory, ignoring effects of gravity, drag and overestimating the height of the source. We determined how accurately the location of the origin can be estimated when including gravity and drag into the trajectory reconstruction. We created eight bloodstain patterns at one meter distance from the wall. The origin’s location was determined for each pattern with: the straight-line approximation, the method includes gravity, and the method we use includes both gravity and drag. The latter
The blood of the unknown person became apparent through comparing the blood type found at the crime scene with the contrasting blood types of the suspects. The blood identified at the crime scene could have possibly belonged to Anna Garcia or Erica Piedmont. This observation was based on the information that the blood type found at the crime scene was type A and these two individuals are the only ones that carry that specific type. In similarity, a microscopic photography was taken of the unknown hair follicle found at the crime scene. Then hair samples were taken from the potential suspects, and the victim. These findings were then compared. This was done by looking at each individuals hair follicles and comparing it with the unknown one. By looking at the similarities and differences in medulla diameter, the discovery of the unknown hair follicle became established that it belonged to Anna Garcia. Further examination resulted in the analyzation of a shoe print found at the crime scene. Shoe patterns and sizes were taken from each suspect, including the victims. They were then identified and compared to the one found at the crime scene. By looking at the distinct pattern, size, and the fact that both shoes were a Columbia brand sneaker it became obvious that the shoe print was extremely similar to Anna’s shoe design. Through this found evidence it became
The criminal justice system has changed a lot since the good old days of the Wild West when pretty much anything was legal. Criminals were dealt with in any fashion the law enforcement saw fit. The science of catching criminals has evolved since these days. We are better at catching criminals than ever and we owe this advancement to forensic science. The development of forensic science has given us the important techniques of fingerprinting and DNA analysis. We can use these techniques to catch criminals, prove people's innocence, and keep track of inmates after they have been paroled. There are many different ways of solving crimes using forensic evidence. One of these ways is using blood spatter analysis; this is where the distribution and pattern of bloodstains is studied to find the nature of the event that caused the blood spatter. Many things go into the determination of the cause including: the effects of various types of physical forces on blood, the interaction between blood and the surfaces on which it falls, the location of the person shedding the blood, the location and actions of the assailant, and the movement of them both during the incident. Another common type of forensic evidence is trace evidence. This is commonly recovered from any number of items at a crime scene. These items can include carpet fibers, clothing fibers, or hair found in or around the crime scene. Hairs recovered from crime scenes can be used as an important source of DNA. Examination of material recovered from a victim's or suspect's clothing can allow association to be made between the victim and other people, places, or things involved in the investigation. DNA analysis is the most important part of forensic science. DNA evidence can come in many forms at the crime scene. Some of these forms include hair; bodily fluids recovered at the crime scene or on the victim's body, skin under the victim's fingernails, blood, and many others. This DNA can be the basis of someone's guilt or innocence; it has decided many cases in the twentieth century. As the times continue to change and the criminals get smarter we will always need to find new ways to catch them. Forensic science is the most advanced method yet, but is only the beginning. As the field of science grows so will the abilities of the
Bevel, Tom, and Gardner, Ross M. Blood Pattern Analysis, Second Edition. CRC Press, Boca Raton, FL (2002).
Muller, Damon A. "Criminal Profiling ." Homicide Studies 4.3 (2000): 234-364. Web. 9 Apr 2011.
In order to reconstruct a crime scene, analysis must classify the bloodstain spatter, and there are many way to classify blood stain patterns: bloodstain spatter by velocity and bloodstain through taxonomy. In the classification of the bloodstain spatter by velocity, there are three basic categories of stain groups...
The word forensic basically means the key to solve a crime. Science is the technology used to help forensic teams to analyze and solve crimes. What can look obvious to the naked eye could actually be a whole other story. Hair samples can determine many things about a person or animal when collected from forensics. There are many job opportunities with a good salary and many openings within the job. This paper will discuss a case where forensic science is needed and how crucial it is in any case.
Forensic science has been in practice for centuries; the first textbook on forensic science was printed in China during the 1200's; in the early 1800's, a technique was developed the first test to identify arsenic in the blood stream; the early 1900's lead to the development of using fingerprinting to identify victims and suspects. While these discoveries where important in criminal investigation, they were only the beginning. Only recently has forensic science significantly refined its techniques and accuracy. Today scientists can locate, identify and trace the tiniest of particles, and identify victims and suspects, beyond a reasonable doubt through DNA analysis. This evolution in forensic science is a prosecutor's dream; while a defense attorney's nightmare. Forensic science has made great strides.
...he case of forensics. You can go beyond the normal reality of blood spatter (?.. how does or where did blood spatter come into play here). The species of a set of bones can be determined through forensics anthropology. The sex of a skeleton. The age of a person and by studying the bones you can find a person’s age. Forensics Anthropology, (2014)
Blood stains are one type of evidence that can be found at a crime scene. Blood that is still in the liquid form should be picked up on a gauze pad. Once the blood is dried thoroughly it should be refrigerated and sent to the Laboratory (Andrus et al., n.d., para. 1). If the blood stain is found dried on clothing, the officer should wrap the piece of clothing in clean paper and place it in a sealed and labeled container. An object with dried blood stains needs to be sent to the Laboratory if it is small enough. If the object is too large to send, then using a clean knife the stain needs to be scraped onto a clean piece of paper, which then can be folded and placed in an envelope (Andrus et al., n.d., para. 2). When collecting autopsy blood samples, the officer should request that the pathologist obtain the sample directly from the heart and place it in a yellow or purple stoppered vacutainer. If the victim is still alive but in serious need of a blood transfusion, then the pre-transfusion blood sample needs to be obtained promptly before the hospital discards it (Andrus et al., n.d., para. 4). It is important for the Laboratory to receive all blood samples within 48 ho...
“Crime Scene Investigator (CSI)”. Explore Health Careers.Org. 18 March 2014. Web. 14 March 2014. .
Gaensslen, R. E., Harris, H A., & Lee, H. (2008). Introduction to Forensic Science and Criminalistics. New York, NY: The McGraw-Hill Companies, Inc. .
In here I will clarify each potential evidences of the crime and explain of the application of the identified forensic procedure to the facts of the case. One of the perpetrators cuts his hand when trying to drag of the witness in the crime scene. Thus, in this case blood stains would be the one of the potential evidence. The precipitin test might be applied to bloodstains in a numerous ways. It conduct...
As far back as 1832, James Marsh was the first to use forensics at trial to give evidence as a chemist in 1832. Since that time forensic science and evidence has come a long way in various ways and technology to help in determine if the suspect is guilt or not, through such things as DNA testing, blood, and fingerprints. The first forensic police crime lab was created in 1910. The contributions of Dr. Edmond Locard, a French scientist and criminologist, proposed that “everything leaves a trace”. This principle is still valid today as it was so many years ago. No matter how small, the specialized trained technicians and investigators can take these methods and go to a crime scene to get evidence. “Forensic science is the application of sciences such as physics, chemistry, biology, computer science and engineering to matters of law.” (Office of Justice, 2017) These different sciences can help achieve and assist in solving a case. Forensic science has also the ability to prove that a crime was committed, it can find the elements of the crime, it can help place the suspect at the scene and whether the suspect had any contact with the victim. However, in the last several years the techniques and with the use of technology the evidence that forensic science uncovers can also exonerate an innocent individual who has been falsely accused of the
It is also possible to calculate the area of origin of spatters three-dimensionally in the given space. This is dependent on the phase of flight that the blood drops are in. The shape of droplets depends on their angle of impact on a surface. Pictures that show different shapes in the case of different angles oversimplify this question. The difficulty lies not in the mathematical calculation itself, which is a case of trigonometric relationships, but in the selection of which droplets to consider and the differential diagnosis of whether the spatter is calculable or not. Novices in the discipline often make mistakes in this respect.