第66章 红衣变态杀人魔案有备而来(第2页)
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毕竟,监控探头太少了,而留在土地上的足迹却四处可见。
如果可以根据足迹看出这么多的信息,那么对于警方缩小犯罪嫌疑人的范围一定有着非常重要的作用。
土地也有硬土地跟软土地之分,所以在根据足迹来计算身高上,也分为平面足迹跟立体足迹之分。
“我们先说平面足迹的计算方法。”
李博阳在小黑板上写道:“赤足足迹x系数uoo3d身高。”
“穿鞋情况下的计算方法,(鞋印长-放余量-内外差+痕迹差)x系数。”
“立体足迹的计算方法为,(赤足足迹-痕迹差)x系数uoo3d身高。”
“穿鞋情况下的立体足迹计算方法为,(鞋印长-放余量-内外差-痕迹差)x系数uoo3d身高。”
“其中系数是一个变量,每一个省份的系数都更不相同。”
“以成年人为例,东北人为6。875;魔都人为6。75;浙江人为6。65;陕西人为6。734;重庆人为6。856;内蒙古人为6。672。”
“李警官。”
有刑警询问道:“如果有人故意在足迹上作假呢?”
“问的好。”
李博阳说道:“有反侦察意识的犯罪嫌疑人的确会有意识地在足迹上作假,比如他是小脚却穿大鞋,又或者是大脚却穿小鞋。”
“在小脚穿大鞋的情况下,步长会变短,步宽变窄,步角变小,重压点后移,足迹边缘不完整,虚边多,前边虚边尤为大,挑痕加重,易出现擦痕。”
“而在大脚穿小鞋的情况下,步长变长,步宽变宽,步角变小,前尖和前掌两侧压力重,前掌重压面前移,后跟重压面后移,后跟后侧严重,脚弓纵长变短可出现扣、磕、迫、推痕,坐痕加重。”
“沙沙沙,沙沙沙!”
不少的刑警都在奋笔疾书地做着笔记,这也让李博阳说话的语慢了不少,好让他们可以把重点给记下来
他们都觉得自己不虚此行啊!
他们都一脸的兴奋,他们没有想到并不起眼的足迹,居然可以看出如此多的信息来。
看到他们兴奋的表情,李博阳也轻松了一口气。
给上百个刑警上课也不轻松啊,李博阳也害怕自己误人子弟啊!
一节课结束了以后,藏汉生拍着李博阳的肩膀对着他夸奖道:“非常精彩,希望下节课同样精彩!”
这次培训共分为三节课。
李博阳第二节课强调的是监控在探案之中的重要性,科普如何利用犯罪心理学来缩小排查范围。
他谈及了洛卡德交换原理,犯罪人只要实施了犯罪行为,由于与周边环境产生物质交换,在犯罪现场必然会相应留下自身的各种物质性痕迹,同时又会从犯罪现场带离某些物质而留下相应的痕迹,而这些痕迹都给侦查指明了方向。
这些痕迹又分为显性痕迹,如犯罪现场留下的指纹、足迹、作案工具痕迹以及因搏斗造成的咬痕、抓痕等。
隐形痕迹则是在微观层面留下来的痕迹,包括dna分子,以及构成犯罪后,犯罪人心里的变化。
当李博阳在讲台上大讲特讲曼哈顿计量法的时候,底下的刑警跟当初的张淳风一样,那是听得无比烧脑啊!
毕竟数学计算题嘛,烧死一大片脑细胞是完全正常的事情!
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