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Important of forensic science
Role of forensic science
Use of DNA fingerprinting in criminal justice
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The amazing world of forensic science can help one to understand how important the methods of fingerprinting and blood testing is. For the past decade, a powerful criminal justice tool and topic referred as forensic DNA and fingerprinting has cleared suspects, exonerated individuals wrongfully accused or convicted criminals of a crime (Saferstein, 2015). DNA has been admitted into court for judges and juries to consider the scientific evidence when hearing a case. In the case of Cupp v. Murphy, the warrantless search of the scraping of blood from the fingernail of an accused murderer was upheld by the Supreme Court. It involved no medical risk nor the risk of destruction of the evidence or the suspect. It allowed forensic science to prove
As we learned this week, DNA databases are used by various governmental agencies for several different purposes. We all have seen new magazine shows such as, 20/20 or Dateline, that show the collection of DNA samples from suspects in a case that is compared to those collected at the scene of the crime. But what happens when the sample is an incomplete match, compromised, or contaminated? The answer is the wrongful conviction of innocent citizens. The case that I have decided to highlight, is the wrongful conviction of Herman Atkins. In 1986, Atkins was convicted of two counts of forcible rape, two counts of oral copulation, and robbery in the state of California. It was alleged that Herman entered a shoe store, and raped, beat, and robbed a
When it comes to identical twins we have come to learn that twin identical or not will not have the same fingerprint. Fingerprints are unique and are made to identify a person. So even when you clone humans or other primates I believe that the Friction ridge pattern will be similar but not exactly the same. I believe that in the process of the cloning process something will cause the fingerprints to come out different. Because cloning is dangerous there has yet to be a human cloning, but there have been cloning of monkeys and according to the data even though the monkey was cloned the fingerprint still isn’t the same.
In 1989 the National Research Council Committee on DNA Technology in Forensic Science was developed due to numerous scientific and legal issues (The Evaluation of Forensic DNA Evidence). The National Research Council’s key role was to analyze statistical and population genetic issues in the use of DNA evidence and review major alternative approaches to statistical evaluation of DNA evidence (The Evaluation of Forensic DNA, 50). Over the past fifteen years DNA profiling has made tremendous advancements and continuous improvements in the fight against violent
Nowadays, DNA is a crucial component of a crime scene investigation, used to both to identify perpetrators from crime scenes and to determine a suspect’s guilt or innocence (Butler, 2005). The method of constructing a distinctive “fingerprint” from an individual’s DNA was first described by Alec Jeffreys in 1985. He discovered regions of repetitions of nucleotides inherent in DNA strands that differed from person to person (now known as variable number of tandem repeats, or VNTRs), and developed a technique to adjust the length variation into a definitive identity marker (Butler, 2005). Since then, DNA fingerprinting has been refined to be an indispensible source of evidence, expanded into multiple methods befitting different types of DNA samples. One of the more controversial practices of DNA forensics is familial DNA searching, which takes partial, rather than exact, matches between crime scene DNA and DNA stored in a public database as possible leads for further examination and information about the suspect. Using familial DNA searching for investigative purposes is a reliable and advantageous method to convict criminals.
Crime is a common public issue for people living in the inner city, but is not limited to only urban or highly populated cities as it can undoubtedly happen in small community and rural areas as well. In The Real CSI, the documentary exemplified many way in which experts used forensic science as evidence in trial cases to argue and to prove whether a person is innocent or guilty. In this paper, I explained the difference in fingerprinting technology depicted between television shows and in reality, how DNA technology change the way forensics evidence is used in the court proceedings, and how forensic evidence can be misused in the United States adversarial legal system.
The acceptance of fingerprint identification in the judicial system as scientific evidence has become like expert testimony. Advances in image processing have impacted how fingerprints can be lifted without being destroyed, which has led to fingerprint evidence becoming the silent testimony leading to more conventions. In the case of the United States v. Byron C. Mitchell Criminal Action No. 96-00407, fingerprints found in the car were the scientific evidence which identified Mitchell as a participant in an armored car robbery (Appellant Counsel for Appellee, 2003).
Every time an innocent person is exonerated based on DNA testing, law enforcement agencies look at what caused the wrongful convictions. There are many issues that contribute to putting guiltless lives behind bars including: eyewitness misidentification, false confessions, imperfect forensic science, and more (Gould and Leo 18). When a witness is taken into a police station to identify a suspect, it is easy for their memories to be blurred and their judgment influenced. This can lead the witness to identify a suspect who is actually innocent. Flawed forensic science practice also contributes to wrongful imprisonments. In the past, analysts have been inaccurate due to carelessness, testified in court presenting evidence that was not based on science, and participated in misconduct. False confessions have also been known to cause unlawful convictions. In some instances, police departments took part in transgression and interviewed their suspects in such an intense manner that a false confession was used cease the interrogation. To imagine that there are innocent people rotting in prison is appalling and something must be done. To prevent wrongful convictions, legislatures should form commissions and policies to reform flawed procedures.
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
This same article examines the history of DNA evidence and acknowledges that when evidence was first introduced to the courts that the new type of identification was initially accepted without any challenges, however, critics quickly contended that DNA tests were problematic because of the reliability and the validity of probative value of the evidence. For example, DNA exoneration cases suggest that errors in forensic identification led to a high number of wrongful convictions and concerns that media coverage portrayals of forensic science evidence on popular television shows leads jurors to unfairly weigh DNA evidence while making their decision about the facts of a trial (Carrell, 2008). Moreover, in recent DNA exoneration cases the courts and jurors had difficulty analyzing the testimony of the experts on forensic identification evidence. According to the article, in 86 DNA exoneration cases, forensic science testing errors were the second leading cause of wrongful conviction, falling behind wrongful eyewitness misidentification (Carrell,
the Use of DNA Evidence to Establish Innocence After Trial. National Institute of Justice, 10, 15. Retrieved from, https://www.ncjrs.gov/
Before the 1980s, courts relied on testimony and eyewitness accounts as a main source of evidence. Notoriously unreliable, these techniques have since faded away to the stunning reliability of DNA forensics. In 1984, British geneticist Alec Jeffreys of the University of Leicester discovered an interesting new marker in the human genome. Most DNA information is the same in every human, but the junk code between genes is unique to every person. Junk DNA used for investigative purposes can be found in blood, saliva, perspiration, sexual fluid, skin tissue, bone marrow, dental pulp, and hair follicles (Butler, 2011). By analyzing this junk code, Jeffreys found certain sequences of 10 to 100 base pairs repeated multiple times. These tandem repeats are also the same for all people, but the number of repetitions is highly variable. Before this discovery, a drop of blood at a crime scene could only reveal a person’s blood type, plus a few proteins unique to certain people. Now DNA forensics can expose a person’s gender, race, susceptibility to diseases, and even propensity for high aggression or drug abuse (Butler, 2011). More importantly, the certainty of DNA evidence is extremely powerful in court. Astounded at this technology’s almost perfect accuracy, the FBI changed the name of its Serology Unit to the DNA Analysis Unit in 1988 when they began accepting requests for DNA comparisons (Using DNA to Solve Crimes, 2014).
Forensic Science, recognized as Forensics, is the solicitation of science to law to understand evidences for crime investigation. Forensic scientists are investigators that collect evidences at the crime scene and analyse it uses technology to reveal scientific evidence in a range of fields. Physical evidence are included things that can be seen, whether with the naked eye or through the use of magnification or other analytical tools. Some of this evidence is categorized as impression evidence2.In this report I’ll determine the areas of forensic science that are relevant to particular investigation and setting out in what method the forensic science procedures I have recognized that would be useful for the particular crime scene.
Forensic evidence can provide just outcomes in criminal matters. However, it is not yet an exact science as it can be flawed. It can be misrepresented through the reliability of the evidence, through nonstandard guidelines, and through public perception. Forensic science can be dangerously faulty without focus on the ‘science’ aspect. It can at times be just matching patterns based on an individual’s interpretations. This can lead to a miscarriage of justice and forever alter a person’s life due to a perceived “grey area” (Merritt C, 2010) resulting in a loss of confidence in the reliability of forensic evidence.
Singer, Julie A. "The Impact Of Dna And Other Technology On The Criminal Justice System: Improvements And Complications."Albany Law Journal Of Science & Technology 17.(2007): 87. LexisNexis Academic: Law Reviews. Web. 10 Mar. 2014.
Forensic science has now been recognized as an important part of the law enforcement team to help solve crimes and cold cases. The advances in technology are being used each day and we must continue to strive to develop better advances in this field. The recent discovery of using DNA in criminal cases has helped not only positively identify the suspect, but it has helped exonerate hundreds of innocent individuals. “With new advances in police technology and computer science, crime scene investigation and forensic science will only become more precise as we head into the future.” (Roufa, 2017) Forensic science and evidence helps law enforcement officials solve crimes through the collection, preservation and analysis of evidence. By having a mobile crime laboratory, the scene gets processed quicker and more efficiently. Forensic science will only grow in the future to be a benefit for the criminal justice