유혈사건 현장의 혈지문 증강 연속처리에 관한 연구
Practical Study on the Sequential Enhancement and Processing of Bloody Fingerprints at Crime Scenes
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초록
본 연구에서는 유혈사건 현장에 남겨진 육안상 관찰이 어려운 혈지문을 분말법으로 가시화시킨 다음 혈액예비검사를통한 혈흔 증강 시약의 사용으로 지문 품질을 개선시킬 수 있는지를 알아보고자 하였다. 총 6가지 종류의 비다공성검체에 유류된 혈지문을 형광분말로 현출한 다음 혈액예비검사를 실시하였으며, 이후 natural yellow 3와 acid yellow 7 그리고 acidic hydrogen peroxide 처리한 결과를 비교하였다. 실험 결과 natural yellow 3가 형광분말로 현출한지문의 품질 수준을 가장 많이 개선할 수 있었으며 형광분말과 natural yellow 3를 연속적으로 사용한 혈지문 시료를대상으로 한 DNA 분석 결과 신원확인을 위한 DNA형 분석이 모두 가능하였다.
Abstract
Bloody fingerprints are considered highly valuable clues in investigations because they are traces left by blood from the body of a victim or suspect. While bloody fingerprints are relatively easy to find at crime scenes due to the red color of blood, they can be difficult to observe with the naked eye when left on dark, rough, or rusty surfaces, or when the blood is diluted. In such cases, they may be treated as latent fingerprints. Bloody fingerprints play a crucial role in proving criminal facts through DNA analysis of the blood components that make up the fingerprint, as well as morphological information. This study aimed to visualize bloody fingerprints that were difficult to observe with the naked eye at crime scenes using the powder method and to compare the effectiveness of additionally using a blood stain fluorescence enhancement reagent through preliminary blood tests on the corresponding fingerprints. Bloody fingerprints left on a total of six nonporous surfaces were visualized with fluorescent powder, followed by preliminary blood tests. Subsequently, they were treated with natural yellow 3, acid yellow 7, and acidic hydrogen peroxide. The experimental results showed that natural yellow 3 improved the quality score of bloody fingerprints the most. The DNA analysis results for samples treated with natural yellow 3 after fluorescent powder treatment indicated that DNA loss occurred during the bloody fingerprint reprocessing process. However, DNA analysis for identification was possible for all samples.