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客观存在的犯罪现场,存在着或多或少的痕迹物证,蕴藏着诸多的犯罪信息,是侦查破案的依据、刑事诉讼的证据来源。但随着社会的法制化、现代化、信息化,犯罪人作案手段越来越狡猾,他们为了逃避打击,不断变换手法,或者伪装现场、毁证灭迹,使遗留在现场的痕迹物证越来越少。因此,刑事科学技术人员除了在现场中心获取必要的证据外,也应高度重视现场外围,以获取与犯罪有关的痕迹物证,更有必要认真分析研究现场外围,以通过现场外围的勘验来印证和弥补现场中心获取证据材料的不足。
Objectively existing crime scene, there are more or less traces of evidence, contains a lot of criminal information is the basis for investigating the case, the source of evidence in criminal proceedings. However, with the legalization, modernization and informatization of the society, the perpetrators of crime have become more and more cunning. In order to evade the crackdown, they constantly change their tactics or disguise the scene and destroy the evidence so that fewer and fewer evidences remain on the scene . Therefore, in addition to obtaining the necessary evidence at the scene center, criminal science and technical personnel should attach great importance to the periphery of the site to obtain the evidence of traces related to crime. It is even more necessary to seriously analyze the periphery of the research site so as to confirm the investigation through the field periphery And to make up for lack of evidential material on-site center.