![]() Since the crime scene investigation generally covers violent crimes, the most common biological material is blood and therefore bloodstains (Andrews and Coquoz 1994 Stojanović 2019 Mushtaq et al. In murder or violent events, it is critical to reveal bloodstains at the scene for crime scene investigation. Due to this reason, analyses of biological materials which are obtained from the crime scene are extremely important and it is possible to carry these analyses to better points (Bond and Hammond 2008 Kamphausen et al. In recent years, by the help of developing technology, DNA profiles which allow individualization serve as a significant evidence to investigate criminal cases. And that shows even if bloodstained fabrics are washed at 60 ☌, the fabrics still can be considered as physical evidence of the crime and can be associated with the scene, perpetrator and victim triangle. ![]() It was determined that while a sufficient amount of DNA for the forensic genetic profiling can be obtained from cotton and nylon fabrics washed at 40 and 60 ☌, a sufficient amount could not be obtained from the ones washed at 90 ☌. Moreover, the rates of obtaining DNA from bloodstains on different types of fabrics washed at several temperatures are shown in this study. The result is that more DNA is lost due to easy exposure to external factors in the non-absorbent nylon fabric type compared to the absorbent cotton fabric. After washing with laundry detergent at 40 ☌, 60 ☌ and 90 ☌ was performed, studies were conducted in order to make bloodstains visible and obtain DNA for genetic profiling. In this study, bloodstains were created on cotton and nylon fabrics in a representative crime scene. This study, it is aimed to determine whether a sufficient amount of DNA can be obtained for DNA profiling used for forensic purposes from blood-stained nylon and cotton fabrics washed at different temperatures such as 40 ☌, 60 ☌ and 90 ☌. However, some studies have shown that bloodstains on a piece of fabric can be used for DNA profiling even after washing. ![]() Some researchers think that washed bloodstains cannot obtain enough quality DNA for DNA profiling. Because blood and bloodstains can potentially be evidence of a crime, offenders often tend to clean or wash them to get rid of relevant evidence. Bloodstains are frequently seen at the crime scene and can be easily detected due to their color and structure. Among the physical evidence, bloodstain is one of the most common biological pieces of evidence at the crime scene, especially in violent crimes. ![]()
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