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职业特点分析作案人如果具有某一职业,经过长期的实践,在使用工具的选择性、熟练性及形成痕迹的规则性上必然会有所体现。下面将一些常在刑事案件现场出现的各种职业所使用的工具及形成痕迹的情况做一个粗浅的介绍。钳工钳工经常使用的工具有金属钻(手摇钻、手电钻)、钢锯、钳工锤、钢锉、钢丝钳等。因其长期、反复使用这些工具,所以对它们的操作具有熟练性。 1.金属钻:定位准确。手电钻有时用铁冲子先冲眼定位再进行钻削;无跳钻现象;钻口较圆;孔底光滑,无卷屑,孔底印压痕常呈圆形反映;钻使用次数多,主切削刃变钝后一般是
Analysis of professional characteristics If a criminal has a career, after long-term practice, the use of tools in the selectivity, proficiency and the formation of signs of the rules will inevitably be reflected. Below, we will give a superficial introduction to some of the tools and traces that are commonly used in various occupations that appear on the scene of criminal cases. Locksmith fitter often used tools are metal drill (hand drill, hand drill), hacksaw, fitter hammer, steel file, wire cutters and so on. Because of their long-term, repeated use of these tools, so the operation of their skilled. Metal drill: positioning accuracy. Hand drill is sometimes punched with iron puncher first and then drilling; no jumping phenomenon; drill more round; hole bottom is smooth, no crumbs, the bottom of the indentation is often circular reflection; use the number of drills, The main cutting edge is generally dull