The Criminal Justice System : Blood Patterns & DNA Evidence

After reading “An Illustrative Homicide Case Involving Blood Patterns” in our text and reviewing the included photos of evidence, I tried to analyze and deeply examine the bloodstain patterns on the husband’s clothing. As known, bloodstains play one of the core roles in helping a forensic team understand the crime case. Sometimes if a person has a victim’s blood on his clothing, it provides evidence against him. The woman was stabbed in the chest and had arterial spurts, and had other knife wounds on her body. I do not think that a man told all the truth about what happened, and despite his “warm contact” of holding his wife, I noticed some strange blood areas on the left knee and the right hip. Additionally, the windows were broken and some clues in the story do not make any sense. The man has defensive wounds, which might mean that the couple had a fight or argued. I think that if the patterns are consistent with man’s story, this man might have more blood on his clothing and in a different pattern. When it comes to his wife, the places of the blood strains look like a man stabbed her with force causing a blood to cast off and get on his jacket. According to our textbook, “cast-off, or arc, patterns result when a bloody object is swung in an arc-like fashion and blood droplets are thrust off the object by force onto a target surface” (Gaensslen & Larsen, 2013). Based on the blood pattern evidence shown in the photos, I have another interpretation as to what might have happened in this case. I believe that woman’s ex-husband broke the window and entered the house. Additionally, there was blood in the kitchen and living room which might indicate that the couple had a fight.  

DNA Evidence

DNA evidence significantly impacts the crime scene and the overall investigation process. This type of evidence strongly influences the crime case decisions and the final conclusion, the individual’s guiltiness, the possible involvements of other people in the crime accident. According to our textbook, “deoxyribonucleic acid (DNA) and blood groups are used to individualize biological evidence because they reveal genetics” (Gaensslen & Larsen, 2013). I believe that DNA has revolutionized the criminal justices system, affected areas such as paternity testing and genetics, and improved the functioning of criminology. As evidence shows, collecting, testing, analyzing, and interpreting the DNA samples is a very complex process that requires strong testing techniques, efficient collection, isolation, database sufficiency, and high qualification of experts. Of course, there are still wrongful decisions and convictions of individuals but if the DNA evidence is presented in correct manner it provides amazing results and significantly helps to professionally solve the crime case. When it comes to one case study of how DNA exonerated a person previously convicted of a crime, I found one case study about Kirk Bloodsworth who was convinced and sentenced to death for the rape and murder of a nine year old girl. The man received a second trial but was sentenced again for two consecutive life terms. after some time of fighting DNA test, samples were examined and analyzed in the lab which concluded that “the DNA found at the scene of the crime did not match Bloodsworth’s DNA, and he was released and pardoned by the Governor of Maryland shortly thereafter” (Arnold, 2009). Bloodsworth fought for a long time for new investigation and interpretation of the DNA samples. Otherwise, he would still have been on the death row. As facts show, “the DNA did match that of Kimberly Shay Ruffner, and on May 20, 2004, he pleaded guilty to the crime for which Bloodsworth was convicted” (Arnold, 2009).

References:

Arnold, P. (2009). DNA Fingerprinting: Three Famous Crime Cases. Retrieved from http://www.brighthub.com/science/genetics/articles/29998.aspx

Gaensslen, R. E., & Larsen, A. K. (2013). Introductory Forensic Science. San Diego, CA: Bridgepoint Education.

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[Accessed: June 1, 2020]

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