第1608章 现场还原

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    告别李阿姨后,王帅和张辉又走访了小区的保安和周边邻居。在保安室里,他们仔细查看监控录像,从案发当晚六点开始,一帧一帧地排查。“注意这个戴黑色鸭舌帽的人。”王帅突然指着屏幕,“昨晚十点十七分,从12栋的
    消防通道出来,怀里抱着大号旅行袋,走路姿势有点僵硬,很可疑。”
    回到现场,杨森和杨林的勘查工作仍在继续。杨森趴在地上,用放大镜仔细观察地板上的血迹:“这里有拖拽痕迹,从尸体位置延伸到落地窗。”他又查看了窗户的锁扣,“锁扣没有撬动痕迹,但窗户缝隙处有半残缺的血指
    纹,杨林,准备提取。”
    杨林取出指纹提取套装,先用磁性粉均匀地刷在指纹所在区域,再用透明胶带小心翼翼地将指纹完整提取,贴在专用的指纹卡上。整个过程行云流水,每一个动作都严格遵循刑侦规范。
    在杨林和杨森两个人基本上完成了现场勘察的一些细节工作之后,陆川来到了门外。
    陆川套上蓝色鞋套,猫着腰跨过警戒线。勘查灯的冷白光下,客厅里的血迹像一幅狰狞的抽象画,凝固的暗红从波斯地毯蔓延到米白墙面上。杨森半跪在尸体旁,镊子夹着的比例尺与地面呈45度角,金属反光映出他专注的
    侧脸。
    “咱们试试看看能不能根据血迹喷射的一些情况和特征细节来还原重建一下案发现场当时发生的这些情况。”
    这一个案发现场和以往陆川。等人遇到的命案现场有些不一样的地方在于血液喷射的情况比较多,死者死亡原因大概率应该是刀伤导致的缺血性休克。
    但具体还要等法医那边的结果,不过这些刀伤导致的血液喷溅,实际上可以为警方破案提供很多的信息,比如说血液喷射的方向,遮挡的方向,有一些血液喷射的角度或者是低落的高度,可以确定犯罪嫌疑人的一些特征,比
    如说身高,比如说。力量情况,再比如说对方和死者是不是认识是不是有冲突等等都能够做出一些简单的判断。
    “第一喷射点在这儿。”杨森的笔尖点向墙面1.7米高处的扇形血渍,“喷溅角度32度,符合右利手从下往上斜刺的轨迹。”他转头看向陆川,防护面罩下的眼神透着兴奋,“凶手身高至少175,挥动凶器时发力很猛。”
    陆川顺着血痕走向落地窗,橡胶鞋底在地板上发出轻微的摩擦声。“注意这些拖曳痕迹。”他蹲下身,激光笔的红点在地面跳跃,“从尸体位置到窗边有五道平行血痕,间距15厘米,说明死者被刺后曾试图爬向窗户求救。”
    杨林举着三维扫描仪绕场一周,设备运转的嗡鸣声混着空调出风口的风声。“墙面血渍分布呈不规则椭圆,边缘有明显的飞溅毛刺。”他调出电脑上的建模图像,虚拟场景里,红色血渍如涟漪般扩散,“致命伤应该在心脏,血
    液喷射瞬间的压力让血滴飞溅到天花板。”
    杨森突然用鲁米诺试剂喷洒墙角,原本光洁的瓷砖表面泛起幽蓝荧光。那些肉眼不可见的血痕像复活的血管,蜿蜒着指向厨房方向。“二次转移血迹。”他声音里带着一丝激动,“凶手行凶后去厨房清洗过凶器,水槽边缘可能
    残留关键证据。’
    陆川走到茶几旁,两只有着口红印的红酒杯静静对峙着。“死者毫无防备的姿态,说明凶手是熟人。”他指着其中一只倾斜的酒杯,“酒液泼洒方向朝左,和墙面的血迹喷射方向一致,说明凶手下刀时站在死者右侧。”
    “看这个!”杨林突然蹲下,紫外线灯扫过地板缝隙。微弱的反光中,半枚带血的鞋印逐渐显现,边缘的锯齿状花纹清晰可见,“43码运动鞋,鞋底有不规则磨损,应该是长期剧烈运动造成的。”
    杨森取出放大镜贴近鞋印:“压力分布不均,前脚掌部分颜色更深,说明凶手发力点靠前。”他比划着跑步姿势,“这人很可能擅长短跑,或者有格斗训练习惯。”
    陆川站在客厅中央,闭上眼睛在脑海中还原场景。再度睁眼时,他伸手模拟凶器轨迹,指尖精准点在墙面血渍中心:“第一刀刺入腹部,死者本能抬手阻挡,所以左臂有防御伤。”他转向落地窗,“凶手顺势将人推向窗边,第
    二刀直插心脏。”
    杨林调出监控录像,画面里戴鸭舌帽的嫌疑人抱着旅行袋走出单元楼。“注意他的步幅。”他暂停画面,在屏幕上标出尺寸,“75厘米,和现场鞋印的步间距完全吻合。”
    杨森突然指着墙面高处的血滴:“这些卫星状喷溅点才是关键。”他用镊子夹起一小块凝固的血痂,“拔刀瞬间血液因离心力甩向四周,形成放射状血滴,每个血滴的椭圆角度都指向凶手站位。”
    陆川盯着墙上的血痕网络,突然快步走到玄关。被勒死的金毛犬尸体旁,他发现了异样:“看这里,门框上有个擦血痕,位置在1.6米。”他伸手比
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