The Effectiveness of DNA Profiling in Forensics Essay

This paper examines Carrell et al’s research along with three other scholarly research articles to better understand the effects that the DNA recovered from a crime scene has on a particular case and the forensic science community.

DNA forensics is a division of forensic science that focuses on the use of genetic material in criminal investigation to answer questions pertaining to legal situations, including criminal and civil cases. Through DNA testing, law enforcement officers are able to identify human remains or the individual responsible for a crime. DNA testing is a highly advanced scientific process that involves replicating the human DNA sequence to create a genetic map of an individual. Because of its reliability, DNA testing has become a significant factor in criminal cases. However, it has also been identified as having the potential to violate privacy and constitutional rights. The DNA identification process consists of five stages. These five stages

In the 1990s, states began to execute mandatory sentencing laws for repeat offenders. This statute became known as “three strike laws”. The three strikes law increases prison sentence for people convicted of a felony. If you have two or more violent crimes or serious felonies, it limits the ability that offenders have to receive a punishment other than life sentencing. By 2003 over half of the states and federal government had enacted the “three strike laws”. The expectation behind it was to get career criminals off the street for the good of the public. However, the laws have their connoisseurs who charge sentences that are often excessive to the crimes committed and that incarcerate of three strike inmates for 25 years to life. Nevertheless, the US Supreme Court has upheld three strike laws and had rejected the fact that they amount to cruel and unusual punishment.

Beginning in the mid-1980s, the development of DNA analysis technology has revolutionised the field of forensic science within the criminal justice system. As the refinement of procedures and technology continues, even minute samples of biological material (including blood, saliva, semen and skin cells) are able to be analysed and used to link or acquit perpetrators of crimes. (Whitney, R n.d.)

DNA testing is a critical and accurate tool in linking accused and even convicted criminals for crimes, and should be widely used to assess guilt or innocence before jail sentences are imposed. It was started up by scientists Francis C. Crick and James D, Watson in 1953 as they had described the uses, structures and purpose of the DNA “deoxyribonucleic acid” genetic fingerprint that contains organism information about an individual (testing

Today in the crime world, DNA evidence is strongly accepted in solving crime cases. This is all based in part by allowing a crime laboratory to have a designated unit whose main goal is to analyze DNA evidence to aid investigators with positive outcomes in crime case solving. With that being said we are going to discuss the functions of a DNA unit within a crime lab as well as address the vital role these units play in solving crime.

The "three strike law" increases the prison sentence of an individual convicted of a felony who has been previously convicted of two or more felonies, and limits the offender to receive anything but a punishment of a life sentence. Twenty-six of the fifty states implement laws that meet the same criteria that would be considered as a " three strike" law. This law was designed to keep those more likely to commit another crime out of the general public however, decrease in violent crimes after this law was implemented is opposing. This essay brings reflection upon how justifiable the third strike rule is.

Due to the uniqueness of DNA it has become a powerful tool in criminal investigations

DNA forensics can also narrow down suspect pools, exonerate innocent suspects, and link crimes together if the same DNA is found at both scenes. However, without existing suspects, a DNA profile cannot direct an investigation because current knowledge of genotype-phenotype relation is too vague for DNA phenotyping. For example, a profile from a first time offender that has no match in any database may give the information that the criminal is a left handed male of medium stature with red hair and freckles. It would be impossible to interview every man who fits that description. However, with available suspects, DNA forensics has many advantages over other forms of evidence. One is the longevity of DNA. Although it will deteriorate if exposed to sunlight, it can remain intact for centuries under proper conditions (Sachs, 2004). Because DNA is so durable, investigators can reopen old cases to reexamine evidence.

Katrina Herrera Mrs. Clark AP English III 04 March 2018 Three Strikes Law Topic: Whether if the three strikes law should be kept and used in states that do not have them. General Purpose: To persuade Specific Purpose: To persuade the class that the Three Strikes Law is beneficial and should be used in other states. Thesis: States should have the three strikes crime laws because it morally gives people chances to change their harmful lifestyles, can keep habitual offenders in prison, and can decrease crime rates.

To formulate the law, it was decided that the most valuable approach to reduce violent crimes was through a mandated policy decision requiring identification through past behavior of those who demonstrated clear conduct to participate in violent criminal and whose conduct was not discouraged by the usual concepts of punishment. Reed (2004) stated, “The overall purpose of punishment within the criminal justice system is to prevent the commission of crimes to deter recidivism. For this objective to be successful, punishment must be effective in addressing the problems and solutions for the entire system, not just in individual cases” (p. 502). In reducing crimes, various methods and theories are taken into account. Some of these methods are additional police, additional courts, mandatory sentencing, and increased prosecutorial resources (Reed, 2004). Because the Three Strikes Law varies from state to state, this leads to the many problems it causes in the criminal justice system.

The results in this lab showed that suspect 2 was a match for the DNA found at the crime scene. This was determined by DNA fingerprinting. In this lab, the samples of DNA from two suspects and the DNA from the crime scene were cut with two different restriction enzymes and then the DNA was run through gel electrophoresis. The different restriction enzymes cut the DNA in different places, so when the DNA was run through the gel, the gel showed two fragments for each sample based on their size. The fragments shown are known as bands of DNA. These bands of DNA for each suspect were analyzed and compared with the bands of the DNA from the crime scene. The bands of DNA were compared based on the distance they traveled through the gel from the wells.

DNA profiling technologies have had a considerable impact on how forensic science and criminal investigation have been understood, carried out, and regulated in the last 25 years. Current methods of forensic DNA profiling (known also as DNA fingerprinting and DNA typing), based on Polymerase Chain Reaction (PCR) amplifications of a varying number of Short Tandem Repeat (STR) loci found at different locations on the human genome, are regularly described as constituting the “gold standard for identification” in contemporary society. Prior to the implementation of PCR based extraction and amplification methods in the 1990’s, the initial uses of DNA fingerprinting (based on Multiple and Single Locus Probes) were largely confined to reactive

Another report from Turman, herarticle about the importance of DNA evidence to say in a strong and definite way that the offenders or to prove prisoner in criminal cases has arose in the media with the developing regularity over the last few years. Criminal justice professionals and the public behold that the forensic DNA technology is reforming

Forensic science involves the use of science to solve criminal and civil crimes but mostly lies on the side of criminal investigations. It makes it possible to identify the criminals based on the DNA traces they leave behind. It involves analyses of blood, DNA and other evidences and later on uses the findings as evidence in the court of law. It helps in solving the various crimes in the world and this has been the greatest contributor to the growth of the sector. Cases that were previously considered impossible due to lack of evidenced tracing to the victim can now be solved using forensic science evidences. The essay aims at analyzing the different aspects of forensic science that are used in the process of solving criminal activities. It will also look at the different cases that forensic science was used to solve crimes in a court of law.