Detection of Human Bloodstains on Natural, Synthetic and Mixed Fabrics by The BlueStar Method
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Abstract
The objectives of this research are 1) to compare bloodstains detection in different weather conditions, 2) to compare bloodstains detection on different types of clothing as follows: natural fiber fabrics, synthetic fabrics, and mixed fabrics, and 3) to study the sensitivity of bloodstains detection at different periods using the BlueStar method. According to the experiment, blood was diluted with distilled water in ratios of 1:100, 1:1,000, 1:10,000, and 1:100,000 by volume. The blood solution was then dropped on two sets of specimens. After that, the specimens were separately stored in two weather conditions. The first one was kept in Thailand’s tropical weather at 30.14±1.78 °C (73.75±6.97% R.H.) and the other was kept in cold weather with 7.58±1.25 °C (53.56±5.78 % R.H.). The bloodstains were examined after 1, 3, 5, 7, and 9 weeks respectively by using the BlueStar method. The results revealed that diluted bloodstains could be better detected in cold weather than in Thailand’s tropical weather. The most diluted bloodstains on the synthetic fabrics were detected at a ratio of 1:10,000 by volume while the most diluted bloodstains on the natural and mixed fabrics were detected at a ratio of 1:1,000 by volume at any period. In Thailand’s tropical weather in which the temperature is not over than 40 °C, the most diluted bloodstains on the synthetic fabrics were detected at a ratio of 1:1,000 by volume at one and three weeks after being stored. Meanwhile, the most diluted bloodstains on the mixed fabrics were detected at ratio of 1:100 by volume at any period. Therefore, this research showed that the temperature, types of fabrics, and the concentration of blood solutions had an impact on the BlueStar blood analysis which could be beneficial to forensic examination.
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เนื้อหาและข้อมูลในบทความที่ลงตีพิมพ์ใน วารสารวิชาการอาชญาวิทยาและนิติวิทยาศาสตร์ โรงเรียนนายร้อยตำรวจ ถิอว่าเป็นข้อคิดเห็นและความรั้บผิดชอบของผู้เขียนบทความโดยตรงซึ่งกองบรรณาธิการวารสาร ไม่จำเป็นต้องเห็นด้วยหรือรับผิดชอบใดๆ
บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการตีพิมพ์ใน วารสารวิชาการอาชญาวิทยาและนิติวิทยาศาสตร์ ถือว่าเป็นลิขสิทธิ์ของวารสาร วารสารวิชาการอาชญาวิทยาและนิติวิทยาศาสตร์ หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใดๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษรจาก วารสารวิชาการอาชญาวิทยาและนิติวิทยาศาสตร์ ก่อนเท่านั้น
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