渗透性客体上汗潜手印与金属遗留印迹联合显现方法研究

Integrated Detection of Latent Fingerprints and Imprints Left by Metallic Tools on Porous Substrates

通过考察茚二酮手印显现法与金属遗留印迹显现法之间的相互影响以及两种方法对纸张上汗潜手印与金属遗留印迹显现效果的影响,建立汗潜手印与金属遗留印迹的联合显现方法。实验结果表明,经茚二酮手印显现法与金属工具遗留印迹显现法显出的印迹在颜色和细节特征反映上均互不干扰,且先显现汗潜手印、后显现金属遗留印迹是复合印迹联合显现的最佳顺序。该联合显现方法的建立不仅弥补了渗透性客体上金属遗留印迹显现中手印反映不完整的缺点,而且还使手印中微量金属信息得以利用,从而为证明犯罪嫌疑人与金属工具之间关联性提供了更强有力的证据。

A novel method of integrated detection of latent fingerprints and imprints left by metallic tools on porous substrates was established by investigating the mutual influence between the 1,2-indanedione latent fingerprint detection technique and the trace metal detection test(TMDT) and the effect of these two techniques on the quality of latent imprints and imprints left by metallic tools.The results showed that fingerprints visualized by 1,2-indanedione and imprints visualized by the TMDT did not interfere with each other with respect to the colour and detailed features.In addition,the best sequence for the integrated detection method was using 1,2-indanedione latent fingerprint detection technique before the TMDT.This integrated method not only can overcome the limitation that incomplete fingerprints were often obtained using the TMDT,but also can exploited the clue in trace metal in fingerprints,which provided more powerful evidences for demonstrating the relationship between suspects and suspected metallic tools.