重叠血迹沉积顺序的形态特征分析

Morphological characteristics analysis for deposition sequencing of overlapping bloodstain patterns

目的 探究重叠血迹的形态特征,判断血迹的沉积顺序。方法 在瓷砖客体上模拟滴落状血迹与血鞋印形成的重叠血迹,分析6组重叠血迹的形态特征差异并筛选有效的指示性特征,统计受试者在经过形态特征指导前后对血迹沉积顺序判断的正确率。结果 受试者掌握重叠血迹的形态特征后,对沉积顺序判断的正确率由59.5%提升至89.0%,对初始血迹干湿情况判断的正确率由45.6%提升至65.3%。结论 基于重叠血迹的形态特征不仅可以有效判断血迹的沉积顺序,还可以判断初始血迹的干湿情况,从而推断血迹沉积的时间间隔,为犯罪现场的分析与重建提供技术支撑。

Objective To explore the morphological characteristics of overlapping bloodstains and judge the deposition sequence of bloodstain patterns.Methods The overlapping bloodstains formed by drip stains and bloody shoe prints were simulated on ceramic tiles,and the morphological characteristic differences of 6 group overlapping bloodstain patterns were analyzed to screen effective indicative characteristics.A survey was held to measure the accuracy of the participants in judging the blood deposition sequence without and with information about the morphological characteristic guidance.Results After participants mastered morphological characteristics,the accuracy of judging deposition sequence increased from 59.5 % to 89.0 %,and the accuracy of judging dry and wet conditions of the primary bloodstains increased from 45.6 % to 65.3 %.Conclusion According to the morphological characteristics of bloodstains,not only the deposition sequence of bloodstains can be effectively judged,but also the dry and wet conditions of bloodstains can be judged,so as to infer the time interval of bloodstains deposition,which can provide technical support for the analysis and reconstruction of crime scene.