It Is a component of virtually every cell In the human body. Further, a person’s DNA is the same In every cell. For example, the DNA in a man’s blood is the same as the DNA in his skin cells, semen, and saliva” (NJ). One person’s DNA is different than every other person in the world. Their DNA is only one- tenth of one percent different from the next person. (DNA. Gob) Even though one person’s DNA is only different by one-tenth of one percent, forensics scientists study and use everything that they can to identify a person based on that small percentage.
Forensic scientists are people who use science for the law, This means hat they study, or investigate crime scenes in order to help solve a case. A person’s DNA is apparent in many different forms. One way is in their blood. Another way is a person’s fingerprint. A third way Is a person’s genetic sample. A genetic sample can be hair, semen, a fingernail, saliva, or even a piece off person’s skin. (Nines). DNA had proven to be the most effective way not only Identify who was at the crime, but it is also the best way to clear suspects that have been wrongly accused.
If the DNA of the accused person does not match the DNA at the crime scene, then that person most likely was not at the crime scene. However, if the DNA does match, then the accused person was there. DNA also stays on evidence from cold cases. This means that DNA technology is the best and most effective way of solving cases. Fingerprinting is a very effective way to help solve criminal investigations. It was first created In 1984, in England, by a scientist named Ales Jeffrey. He realized that the sequence of someone’s DNA Is different some another person. He called the technique, variable number tandem repeats.
He claimed that the technique can identify a single individual from “1000 trillion trillion trillion people. ” (Nines). DNA was iris used in a case in June 1987. (Nines) In Bristol, England, a burglar broke into a house and attacked an invalid woman and stole her jewelry. The investigators of the scene managed to obtain a sample of the burglar’s DNA from the woman. Later on, as the case proceeded, a man name Robert Melba was arrested for a burglary in the same district In England. Meals was put Into a police lineup, and the Invalid lady identified him as her attacker.
The investigators took his DNA, and it matched the DNA at the crime scene. His trial was held in November 1987, and he was sentenced to eighteen years in prison. This case made the use of DNA technology in crimes more accepted. It also officially allowed DNA technology at crimes scenes to be used in investigations. (Nines) Blood is another type of DNA evidence. Blood at crime scenes are the most obvious evidence. Scientists have created a way of Identifying criminal investigations. “That is because the analysis of the substance deoxyribonucleic acid, can detect a single individual among the total population of the world” (DNA. Ova). There are four different types of blood. The types are: A, B, O, and ABA. Each person has one of the four different types of blood. Thirty-nine percent of the world has blood type A. Thirteen percent has blood type B. Forty-three percent of the world had blood type O. That leaves five percent for blood type ABA. Knowing this information is very helpful to investigators because if a certain blood type was found at the crime scene, then there a good chance that a person with a different blood type was not there. Nines) At the crime scene, the criminals sometimes try their best to clean up any blood evidence. However, with the knowledge and technology the investigators have, they can identify blood at the crime scenes even if it actually isn’t here. They can take stains at the scene and turn it into blood evidence. In order to do this, first they use a moistened cotton-bud and take a piece of the stain. Then they transfer the cotton-bud to a paper test strip. That strip contains a chemical that turns blue-green when it comes in contact with blood.
Scientists also have another way of identifying blood at a crime scene. “Investigators can reveal the traces by spraying the suspected areas with a fluorescent chemical, then illuminating the areas with ultraviolet in the dark. ” (Nines). In conclusion, blood can easily be found at the rime scene, and it can rule out people that have been suspected to be at the crime scene. Genetic samples also help investigators solve crimes. The genetic samples can be present in many forms it can be in the form of hair, semen, a fingernail, saliva, or a person’s skin. All of these things contain DNA.
These things, such as saliva and fingerprints, can be found on other objects at the crime scene. They can be found on items such as: cigarettes, candy wrappers, and even a doorknob. That is what scientists use to identify one person from the next. It is also the main type of evidence in solving crimes, cold cases, and even future crimes. The National Institute of Justice currently defines a cold case as any case whose probative investigative leads have been exhausted. In essence, this means a case that is only a few months old may be defined as being cold. ” (NJ).
The criminal may unintentionally leave one of these things behind. That is why it is up to the investigators to carefully identify the scene for any traces of DNA. One cold case that was solved with DNA is the murder of 5 year-old girl Lie Barreled. This took place in Englewood, Colorado in 1993. The girl was kidnapped from her apartment complex, where she was eating pizza with other children in the parking lot. The police had put out a giant search for her. The search included policemen, fire workers, and scent-tracking dogs. Her body was found four days after the kidnapping, about fourteen miles away from her home.
They examined her body and they found someone else’s fingerprint on her underwear. It belonged to her neighbor, Nick Store. At the time, they didn’t have the right technology to solve the case using Just a fingerprint. Since they didn’t have any other evidence, Nick Store was never arrested. Over time, the police department had started using DNA technology in criminal cases. Eighteen years later, they reopened he case and matched the DNA they found on Lie Berryless underwear, to Nick Store. However, he was not arrested because he had died ten years prior. Asses. If it was not for the technology, the case would forever be unsolved. Also, many other cases may have gone unsolved because of the lack of DNA technology. This is why DNA technology in crimes should be more accepted. In conclusion, the use of DNA technology in crimes is the most accurate way of solving criminal investigations. It has the power to identify everyone that was at the scene of the crime. It even makes it possible to solving cold cases from decades ago. It accomplishes this through the evidence of fingerprints, blood, and genetic samples.