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Dna profiling abstract paper
Dna profiling abstract paper
Effectiveness of DNA profiling
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Stephen Lawrence was born on 13th September 1974 and lived in Eltham, South East London. He had both his parents, Neville and Doreen Lawrence, a brother Stuart and a sister Georgina. He was a typical teenager; he went to school, had a busy social life, was committed to his family and was in part-time employment. He had plans to become an architect and always wanted to have a positive impact in the community he lived in (www.stephenlawrence.org.uk). Stephen was of black British ethnicity, and at 10:35pm on the 22nd April 1993, a gang of white youths saw this as enough reason to attack the 18 year old (www.bbc.co.uk). Stephen had spent the afternoon with his friend Duwayne Brooks. They were heading back home together later than they usually …show more content…
would. They got to the bus stop on Well Hall Road at 10:30pm. Stephen walked further up the road to check if the bus was coming whilst Duwayne stayed near the bus stop. Duwayne saw a gang of five or six youth on the other side of the road, opposite to where Stephen was. He shouted over to Stephen to find out if he could see a bus coming. The white youths on the other side of the road started to shout racial remarks towards Stephen, before running across the road and attacking him. Duwayne and Stephen began running after the gang left, however Stephen had been stabbed twice and only made it about 100 metres before collapsing and eventually dying on the side of the road (www.gov.uk, Sir William Macpherson, 1999). Stephen Lawrence was murdered simply because of the colour of his skin. The Stephen Lawrence case became one of the biggest cases in UK history linked to racism. It changed many people’s view on racism, including the metropolitan police services who were accused of institutional racism (www.telegraph.co.uk, Thomas B, 2013). Two weeks after the murder of Stephen, the Lawrence family complained that the police were not doing as much as they should be to catch Stephens’s killers. Five years on in September 1998, the Macpherson report accuses the Metropolitan police of institutional racism. As a result the police promised the Lawrence family that they would do all they could to eliminate corruption within the police service, which lead to extreme changes in policing (www.telegraph.co.uk, Evans M, 2012). There was not much immediate evidence after the crime, however there was some.
Duwayne Brooks was with Stephen at the time of the murder which meant he was a potential eye witness. The metropolitan police received a number of tip-offs which gave them five names, Neil Acourt, Jamie Acourt, Gary Dobson, David Norris and Luke Knight, all of which were believed to have racist views and were known for violence. However the police didn’t make any initial arrests because they believed it was important to gather evidence on the suspects beforehand. Eventually arrests were made and clothing was seized after the Lawrence family accused the police for not acting on the tip-offs during a conference. All five suspects soon walked free due to a lack of evidence and Duwayne Brooks eyewitness evidence not being reliable enough. This was thought to be the end because at the time there was law in place stating that nobody could be tried twice for the same crime (www.bbc.co.uk, Casciani D, …show more content…
2012). The McPherson report found that the police had failed to investigate the case fully and properly. They said it was due to metropolitan police officers being corrupt and many being institutionally racist. Changes were made in relation to equality and justice regulations. The Race Relations Amendment Act 2000 meant that the police service, local councils and government departments have to show what they are doing in an effort to treat people fairly. The Criminal Justice Act 2003 got rid of the double jeopardy rule, meaning that someone can be tried again for the same crime if new evidence arises. The Stephen Lawrence case was reopened and everyone started from scratch, ‘assuming nothing and reviewing everything’ (www.bbc.co.uk). Forensic science is any science used for the purpose of the law. It’s based on chemistry and biology and it provides scientific evidence for use in the courts of law. Forensic scientists examine and test evidence found at crime scenes in order to provide scientific evidence to assist in the investigation and court proceedings (www.staffs.ac.uk). Forensic scientists played a key role throughout the case. When the case was opened in 1993 they examined the clothing that was seized. However they did not find any evidence, either because they missed it or they did not have effective techniques available to them at the time (www.bbc.co.uk). There have been many developments in forensics since the case in 1993. A cold case review was launched by the Laboratory of the Government Chemist (LGC) in 2006. The LGC is a science based company that provide biochemical, chemical and DNA based analysis. They often assist police forces with investigations in and outside the UK (www.lgcgroup.com). The LGC examined the seized clothing that had been previously examined by forensic scientists in 1993, and this time evidence began to emerge. Techniques were used that didn’t exist in 1993. The main development in forensics that affected the Stephen Lawrence case was the size of Deoxyribonucleic Acid (DNA) that could be tested. DNA is defined as …… carries an individual’s genetic information and is what makes people forensically different. It’s found in chromosomes which are located in the nucleus of most cells. DNA is key in forensic science (www.bbcbitesize.co.uk). In 1993 DNA had to be a certain size for forensic scientists to be able to test it.
Now however, DNA like blood stains can microscopic and still be found and tested. These techniques led to the findings of blood, hair and fibres, all of which proved to be vital evidence. (www.metro.co.uk). Low Copy Number (LCN) is another method that is now used. LCN is a type of DNA profiling. It works by copying DNA molecules enough times so that the DNA can be detected by the analyser. When using the LCN technique the DNA sample is often copied about 34 times. This technique is capable of turning just one molecule of DNA into a number of molecules. There are other DNA profiling kits like SGM+ and the Identifier which work much the same as the LCN (www.theforensicinstitute.com). Polymerase chain reaction (PCR) is another development in forensics. PCR is another technique used to amplify and copy small molecules of DNA. Although forensics has developed since 1993, there are still many tests that take place in the laboratory that require DNA to be a sufficient size. PCR has been said to be one of the most important scientific advancement in molecular biology
(www.genome.gov.uk). The first time any blood was spotted was when forensic scientists used a micro spectrophotometer to figure out the colour of one of the fibres on Gary Dobson’s jacket. The whole jacket was then looked at with a microscope, magnifying it 40 times. A tiny blood stain measuring at 0.5mm x 0.25mm was found on the collar of a bomber jacket owned by Gary Dobson. The stain was only found when the jacket was examined using a microscope. In 1993 forensic scientists often would not even look for such tiny samples because at the time it was not possible to test it (www.BBCNewsbeat.co.uk, Cairns D, 2012).This evidence placed the wearer of the jacket at the scene. The jacket was placed in an evidence bag when it was seized. Forensic scientists found tiny flakes of blood in the evidence bag that matched Stephen Lawrence’s DNA (www.bbc.co.uk). Fibres were also found in the evidence bag holding the bomber jacket. The fibres were said to have a high probability of matching Stephen’s cardigan. The bomber jacket itself had fibres on it matching Stephens polo shirt and jacket. Gary Dobson’s cardigan also held fibres on it which matched the cuffs on Stephens’s jacket. It was argued that there was a chance of contamination because the evidence bag either hadn’t been sealed properly or the seal had broken (www.bbc.co.uk). A pair of trousers and a sweat shirt was taken from David Norris. The trousers were examined for blood, fibres and hairs but nothing was found. However the evidence bag which was holding the trousers was also examined and two hairs were found inside. One hair measured at 1mm and the other 2mm. Both hairs were tested for mitochondrial DNA (MtDNA). MtDNA is passed down through the maternal line, meaning women pass it down to their children and men do not. The geneticist who examined the MtDNA told the court that the chance of it not coming from Stephen was one in 1,000 (www.bbc.co.uk). When the sweat shirt was examined several fibres were found. Six fibres matched Stephens’s trousers and one matched his polo shirt (www.bbc.co.uk). Gary Dobson and David Norris were found guilty of the murder of Stephen Lawrence. They were both given life sentences (www.bbc.co.uk). The Damilola Taylor case has similarities to the Stephen Lawrence case. Damilola Taylor was a 10 year old boy who was stabbed and left to die in Peckham, South London in November 2000 (www.courtnewsuk.co.uk). The two cases are similar because the killers were only brought to justice when a clod case review was launched. In fact the Stephen Lawrence cold case review was hugely influenced by the success in the Damilola Taylor cold case review amongst others (www.independant.co.uk). If this case or a similar case occurred today, the minimum sentence would be roughly 30 years, whereas in 1993 the minimum sentence was only 15 or 16 years. It took nearly 19 years to bring Stephens killers to justice. If the case had occurred today, the techniques and equipment forensics now use would mean the perpetrators would be convicted much quicker. After examining the clothing the first time around, evidence would be found and would be enough to convict Gary Dobson and David Norris, as proved in the cold case review (www.courtnewsuk.co.uk).
In certain situations, it is necessary to identify DNA retreived from a sample. When there is a
The repeat segments are cut out of the DNA strand by a restrictive enzyme that acts like scissors and the resulting fragments are sorted out by electrophoresis (Saferstein 391). However, there are some drawbacks using the RFLP method in the forensic science community. The RFLP technique requires a large amount of DNA and must be of high quality and cannot be degraded (Jones). Forensic scientists and the law enforcement community determined a need for a DNA profiling method that could be used on smaller DNA samples. Thus, the RFLP technique has been almost entirely replaced by Polymerase chain reaction.
DNA is the blueprint of life. It stores our genetic information which is what is in charge of how our physical appearance will look like. 99.9% of human DNA is the same in every person yet the remaining .1% is what distinguishes each person (Noble Prize). This small percentage is enough to make each person different and it makes identifying people a lot easier when its necessary. DNA not only serves to test relationships between people it also helps in criminal cases. DNA testing in criminal cases has not been around for many years if fact it was not until the early 1990s when the use of DNA testing for criminal cases was approved and made available. By comparing the DNA of a suspect and that found in the crime scene a person can either be convicted of a crime or they can be exonerated. This method of testing gained more publicity in the 1984 case of Kirk Noble Bloodsworth a man who had been convicted of the rape and first degree murder of a nine year old girl in Maryland. His case was a milestone in the criminal justice system since it involved the use of new technology and it also raised the question of how many people had been wrongly incarcerated for a crime they did not commit.
Stephen is being made fun of by a group of boys who want to fight him. He faces this a lot and it is one of the causes he is cold. He believes that everyone hates him and that he is alone. Stephen tries to cut off all of his Japanese ties and unlearn the Japanese language. The constant hate of himself and his race causes this. "He grunts as Obasan tries to help him with it. Stephen has made himself altogether unfamiliar with speaking Japanese." (231) Stephen tries to be something he is not and does not know what it is that he wants to be. He quits being Japanese. Over all the affects on Stephen are significant. Stephen starts to hate himself and his family. Also he starts to hate his entire race.
D. H. Lawrence was probably a very angry man. His writings are full of extremely intense feelings of anger and hate which do not seem to belong. This anger is usually connected to love, but can be classified by what other emotions it is also linked to. For example, in "Second Best," there is no real reason for Anne to feel great fury, yet she does towards the mole. Anne somehow equates the mole with a barrier to her success in love, so she hates it. In "The Shadow in the Rose Garden," the intense anger is connected to jealousy. The husband is extremely jealous of his wife's prior involvement with Archie. In "The White Stocking," the anger is also associated with jealousy. Ted does not like the fact that Elsie has been accepting gifts from Sam Adams. The sisters in "The Christening" have intense resentment towards their youngest sister Emma, who ruined the family reputation. This translates into anger directed at her and the world in general. Lastly, the title character and the Orderly in "The Prussian Officer" have a love-hate relationship, except one hates, the other loves. The Orderly, as recipient of unwanted love, feels great resentment and anger towards the Officer, so much so that he kills him.
The most important type of evidence is DNA. When DNA testing takes place, the samples are collected from the suspect and the crime scene. These evidences include hair, fingerprint, human secretions, blood, semen and other bodily fluids, are collected and sent to the lab for further investigation.
So much has been invented techniques such as (10): Autopsies(a post-mortem examination to discover the cause of death ), Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS)(When broken glass is involved in a crime, putting together even tiny pieces can be key to finding important clues like the direction of bullets, the force of impact or the type of weapon used in a crime.),Video Spectral Comparator 2000( For crime scene investigators and forensic scientists, this is one of the most valuable forensic technologies available anywhere.),Magnetic Fingerprinting and Automated Fingerprint Identification (AFIS) (crime scene investigators, forensic scientists and police officers can quickly and easily compare a fingerprint at a crime scene with an extensive virtual database). Technology has improved so much since the Jack the ripper case, I do think Jack the ripper had a massive impact on the forensic science police investigating because they learnt so many things and ways to better themselves in investigative policing that without the Jack the Ripper case they might not have come
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
Once a crime has been committed the most important item to recover is any type of evidence left at the scene. If the suspect left any Deoxyribonucleic acid (DNA) at the crime scene, he could then be linked to the crime and eventually charged. A suspect’s DNA can be recovered if the suspect leaves a sample of his or her DNA at the crime scene. However, this method was not always used to track down a suspect. Not too long ago, detectives used to use bite marks, blood stain detection, blood grouping as the primary tool to identify a suspect. DNA can be left or collected from the hair, saliva, blood, mucus, semen, urine, fecal matter, and even the bones. DNA analysis has been the most recent technique employed by the forensic science community to identify a suspect or victim since the use of fingerprinting. Moreover, since the introduction of this new technique it has been a la...
Evidence shows that investigations of crime scene went on as far back as prehistoric times (Taylor 1). From evidence it shows that early men would take their fingerprints by pressing their fingers into clay or into rock (Taylor 1). Ancient Babylonians used this way for business and to try to save them for a mean of identification. Also, the prints were used for other official needs.
Strands of human hair situated at the crime scene gives exceptionally solid sign that an individual was at that area, yet it can likewise be useless if the fibres were found outside and, subsequently subject to the elements such as wind, and if the full length of the strand is not present (Dasgupta, 2007). Hair without anyone else 's input is essential, but rather the most imperative DNA evidence connected with hair fibres originates from the cellular material at the root of the hair strand. In a way, the microscopic particles of follicle give the most solid proof. The protein called keratin is the key substance that goes with the follicle, and that gives the best distinguishing proof. On the off chance that the hair is taken off by the root, for example that could happen when an individual is guarding him or herself against an attacker, then the hair fibres are essential (Innes, 2000). Hair that does exclude follicular material is a great deal less dependable. Hair fibres that do exclude keratin are helpful in distinguishing a category of individual into which a suspect may fit, however they are not complete evidence that the hair originated from the suspect (Innes, 2000). Therefore, personally, hair fibres are less important than fingerprints and DNA evidence acquired from saliva or blood. Fingerprints are not DNA evidence, but still they are extremely dependable types of evidence. DNA obtained from bodily fluids, in any case, is the most profitable type of evidence
Stephen is the brother of the narrator, he is described as a typical addict: cries for help, play the people who is helping them and return to their lifestyle. “.. The
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
The focus of this report is The Battle Of Stirling Bridge, as well as William Wallace, a famous commander and leader during Medieval Europe. This report will go into detail about this significant event, person and the impacts that they had on Medieval Europe. A lower class land owner, William Wallace (Figure 1) was a well-known Scottish knight who fought for Scotland’s political rights. Being born into a family of nobility, he was soon inducted into the minor lords of Scotland.
Even as a young boy, Stephen experienced rejection and isolation at school. On the playground Stephen "felt his body [too] small and weak amid the [other] players" (Joyce 8). His schoolmates even poked fun at his name. In response to his rejection by the other boys Stephen makes a conscious decision to "[keep] on the fringe of his line, out of sight of his prefect" and the other boys. Stephen is later depicted as choosing the "warm study hall" rather than the playground with his friends outside (Joyce 10). His rejection at school leads him to isolate himself in his schoolwork, thus putting himself on a scholarly path that will give him the intellectual skills necessary for the artist within him to achieve adulthood.