换穿鞋足迹检验技术在案件侦破中的应用

Composite Examination of Unique Traits of shoeprints to Recognize the Suspect Wearing Various Shoes to Commit Crimes across Years

目的研究跨年度换穿鞋足迹检验技术在案件侦破中的应用。方法依据同一人在步法特征、鞋底磨损特征、动力形态特征上具有相对稳定性的原理,从行走过程中落脚阶段到垂直支撑阶段再到起脚阶段所反映出的踏痕、压痕、蹬痕的位置形态长度、脚弓形态、边缘部位动力形态这几方面进行比对检验,进而对跨年度换穿鞋足迹进行检验鉴定。结果选取自不同年份的5起现场足迹与样本足迹在脚大小、脚弓形态、蹬踏痕位置形态长度、内外虚实边位置形态长度等方面均具有较高符合性。结论选取自不同年份的5起现场足迹与样本足迹不排除为同一人所留。

Objective To explore the examine method about recognizing shoeprints left with various shoes worn by same suspect in different years. Methods Based on the principle that the same person owns the relatively characteristic stability of gait, sole wearing and dynamic pattern, shoeprints collected from crime scenes in different years were compared on the tread, press and kick marks with their forms and lengths, shapes of arch, and dynamic patterns appearing at the surrounding edges of the prints that were given birth during the walking course from foot falling to vertical supporting and consecutively to foot raising. Five shoeprints left on the crime scenes in different years were selected to match against the suspect＇s sample footprint on the aspects of foot size, arch shape together with the position and pattern plus length of both the tread mark and the mark＇s solid/shadowy edges of its left/right sides. Results The selected five shoeprints are consistent to the suspect＇s shoeprint aspects. Conclusion The five shoeprints left on the crime scenes across years are not able to be excluded to be left by the suspect.