Introduction
“Crime scene processing is a critical component in the resolution of crimes against persons and property, to include homicide, sexual assault, aggravated assault, robbery, and drug use” (Hunkeler, I). When searching the term fingerprints on Merriam-Webster, one finds numerous definitions for the term and learns that there are various types of fingerprinting. One classification reads that fingerprints are “an ink impression of the lines upon the fingertip taken for the purpose of identification” (Merriam-Webster). Another definition explains that fingerprints are “the base-pair pattern in an individual's DNA obtained by DNA fingerprinting” (Merriam-Webster). Both of these definitions provide a worthy understanding of fingerprinting,
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Often people do not even realize that they are leaving these fingerprints on everything they touch. This is so because fingers are always sweating, regardless of whether the hands feel sweaty or oily. These fingerprints are a mix between the sweat from the hands and contaminates from the environment. Fingerprint powder is necessary to find these prints because they can be left anywhere and on anything but are not visible to the naked eye. Typically, they are left unknowingly and accidently. Fuming is also used to discover these types of prints because they are often old and this process causes the fingerprints to appear. Once fingerprints are discovered, they are brought back to the lab to be entered in the computer. They are then cross-referenced with the database of criminal fingerprints and a match can be found in a matter of seconds. Latent fingerprints are the most …show more content…
Without the use of fingerprinting, more than half of criminal cases and matters would go unsolved with no clues or leads. Fingerprints are one of the most important criminal investigation tools for two reasons: their persistence and uniqueness. Persistence refers to the fact that fingerprints do not change over time and no matter what will always remain the same. The ridges which create fingerprints are formed while inside the womb and grow as the baby grows. Permanent scarring is the only way a fingerprint can change but is very rare. Uniqueness means that each fingerprint is different; no two fingerprints are the same. Even identical twins have two different sets of unique fingerprints. With the different formations of fingerprints and the different types of fingerprints, they will always be the key factor to finding clues or leads to a case. Not only can fingerprints reveal a criminal, but they can also reveal people who were involved in the case or at the crime scene. These people can play a vital role to a case and help give important details to who the guilty person is. Fingerprints are a very dynamic topic and in order to learn the full concept of fingerprints and understand how to collect them, should take some
Thesis Statement: In this speech I am going to explain how forensic teams use fingerprints to identify individuals.
From the early days, with little literary reference material, to the current day, with substantially more, but still insufficient formation, the science of fingerprint identification has managed to maintain its credibility and usefulness. Although, academic institutions have yet to recognize the field as an applied science and include it in the curricula, which would provide directed research and literary reference, in libraries. Without this academic recognition, progress in the field of fingerprint is destined to be sluggish. Description of fingerprint identification as a forensic science’ or an ~app1ied science’ in no way implies that is not a reliable science. Fingerprint identification, correctly understood and applied, is just as scientifically valid and reliable as any other science and, indeed, more accurate than many. The fingerprint expert applies knowledge gained through training and experience to reach a conclusion. The many uses of fingerprint identification range from criminal investigation to non-criminal matters such as deceased, missing persons and disaster victim identification. Fingerprint identification has been used in the court systems for many years. Yet there are those who that still try to challenge fingerprint science and the experts in the court of law by a Daubert Hearing. In this paper, Daubert Hearing is define and detail outing background of the cases, the Government preparation, the Testimony from both sides, the judge’s verdict and finally, Mitchell’s second trial on this case.
Another discrepancy between actual forensics and how it is portrayed in the media is the availability of information in databases. There is only a small percentage of the entire population’s fingerprints or DNA samples stored within databases such as the Integrated Automated Fingerprint Identification System (IAFIS). This makes finding a match between a DNA sample or fingerprint difficult, as a match would only be found if the person’s information was already stored within the database. If there is no match previously stored in a database, the fingerprint or DNA sample could be potentially rendered useless within a trial. Typically, in order to perform an analysis, investigators must already have a suspect in mind and request a DNA or fingerprint sample from him or her. If the suspect does not want to provide one however, the sample collected as evidence may not count as valid. The CSI effect creates an idealized image that all crimes can be solved with a hair or drop of blood, but this is not always the case in real life.
The easiest way to figure out who was at the crime scene is by taking fingerprints. Good impressions such as fingerprints can be the most valuable pieces of evidence in a forensic investigation. Impressions help link a person to a crime scene or crime as well can provide information on any weapon that could've been used at the scene. An educated technician would compare and search fingerprints manually and on AFIS computer system for classification, comparison and identification. "Analyzing evidence is not a quick or simple process.
Contextual information also affects the human comparative part of fingerprint analysis, in ways that alter the matching of the same fingerprints, years apart; however, when contextual information is provided, it actually helps 20% of forensic technicians, but that still leaves 80% hindered by contextual information (Dror et al, 2006). Contextual information affects the psychological aspects of perception and problem-solving, in a way that can obscure information that does not support the context, and it can even affect how forensic technician’s view and handle forensic evidence (Bernstein et al, 2013). However, there are some advantages of contextual information, because it can give the forensic division a mental shortcut, saving time and money; however, these shortcuts lead to inaccurate and biased conclusions. This essay has shown that contextual information creates erroneous mistakes and prejudiced results in forensic investigations. A possible way to remove the negative effects of contextual information is to have the forensic technicians, not know the context of the crime so that they do not
DNA fingerprinting, or sometimes known as DNA typing, is isolating and developing images of sequences of DNA to evaluate the DNA in an individual’s cells. DNA fingerprinting today is used for many different things in many different areas of science. In forensic science, DNA typing can determine which person did which crime by using blood or skin left at a crime scene. In medical science, patients can find out who their siblings, parents, or children are by using DNA fingerprinting (webmd).
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
Although physical proof is vital in police investigations, when there's depleted evidence present at the crime scene, offender profiles are often created to lead law enforcement towards physical evidence and possible suspects. This is important as physical evidence such as fingerprints, fibres and biological evidence, aids to establish the guilt or innocence of potential suspects, although criminal profiling can be used in court it itself is not evidence but built of evidence from the crime scene to establish
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...
In order to understand how to compile evidence for criminal cases, we must understand the most effective types of evidence. This topic is interesting because there are ample amounts of cases where defendants have gotten off because of the lack of forensic evidence. If we believe forensic evidence is so important and it affects our decisions, then maybe we need to be educated on the reality of forensic evidence. If we can be educated, then we may have a more successful justice system. If we have a more successful justice system than the public could gain more confidence that justice will be served. In order to do this, we must find what type of evidence is most effective, this can be done by examining different types of evidence.
The three different main types of fingerprints are Loops, Arches, and Whorls (Jackson 1). Henry Faulds is known as the Father of Fingerprints and developing fingerprints (Jackson 1). His discovery of fingerprints has made a huge impact not only in his time but, in Modern Crime Scene Investigation (Jackson 1). Without fingerprinting, it would be very difficult to convict criminals of crimes and very hard to try to process information. Crime Scene Investigators make a huge impact in Forensic Science. We need CSI workers, without them people could only imagine what crime would be like not only in our community, but in our
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.
The typical patterns of genetic profiles are produced by electrophoresis of treated samples of DNA. This patterns may be called fingerprints. In criminal investigations, there are tested about 10 sites of the DNA. If the banding patterns produced by the tested DNA samples of a suspect in a crime, and the samples taken from the crime scene are the same, it is enough evidence for convicting a suspect and taking him to jail. The 99% of human DNA is exactly the same for all the people, even though, a single droplet of blood, or an eyelash collected in a crime scene, contains all the genetic information needed of every single person in the world, to convict a criminal. DNA profiling has have a huge impact in many things, from the...
Crime investigators have the job to solve crime and find the suspect responsible. Sometimes the offense is very difficult to solve, but with the right pieces of evidence and tools, the investigation can be answered a little more easily. The use of fingerprints is a main tool used at crime scenes. Investigators find these at the actual crime scene and analyze them at the lab to determine whom the prints belong to. Each person has an individual print which is why this is a very useful piece of evidence. Sir Francis Galton found that the prints could be categorized into different types as well as different groups. The research of fingerprints from decades before has shaped the way detectives identify suspects and victims.
The accuracy and reliability of criminal statistics is something that has been of great discussion through criminology for decades. Whilst some believe that crime statistics are a misuse of time and resources, others believe that there is some use for them within the criminological community. The inaccuracies of criminal statistics are highlighted in abundance within academic articles and research, many of which highlight the main source as the dark figure of crime. Many also suggest other inconsistencies within official statistics to be influenced by law enforcement agencies and society. But whilst there is much research to suggest that criminal statistics are unreliable and of no use, there are some that suggest that this may not be entirely