第2217章 警戒带内

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    陆川示意身边的民警去安抚李建国,自己则走到警戒带旁,对杨林和杨森说:“按照流程来,先固定现场方位和概览,再从外围开始勘查,逐步向中心推进,记住,先固定后提取,先重点后一般,不要急,一定要细致。”
    杨林和杨森点点头,各自拿起工具,开始了勘查工作。杨林手持全画幅单反相机,搭配广角镜头,先走到距离核心现场一百米的位置,拍摄了第一张现场方位照片,照片中清晰地记录下了案发地点在北山林场的具体位置,以及周边的地形地貌、林间道路分布,还有远处的废弃瞭望塔和西侧的废弃采石场。随后,他又分别在五十米、三十米的位置,拍摄了不同角度的方位照片,每一张照片都纳入了比例尺和现场方位标识,确保空间关系准确无误。
    杨森则手持摄像机,全程同步录相,镜头从警戒带外开始,缓缓推进,完整记录下勘查人员进入现场的路线、现场的原始状态,以及杨林的拍摄动作,形成音视频同步的勘查资料,为后续的现场重建和法庭质证留存依据。与此同时,他还拿出现场绘图板和测距仪,对照着林场提供的林区地形图,开始绘制现场方位图和平面示意图,先用测距仪精准测量现场边界的长度、尸体与巡山小径的距离、尸体与周围树木的间距,再按照比例一点点绘制,每一个数据都反复核对,生怕出现一丝误差。
    陆川站在警戒带外,目光紧紧盯着核心现场,结合地形和现场状态,在心里做出了初步判断。这里位置偏僻,远离主巡山道,平时除了巡山员和少数采药人,几乎没有人会来,死者若非林场工作人员,或者是熟悉林区地形的人,很难独自走到这里。尸体呈俯卧姿态,体表有明显外伤,现场没有发现凶器和随身证件,初步倾向于他杀,至于是就地行凶还是抛尸至此,还需要进一步勘查地面的足迹和植被痕迹来确认。他又叮嘱杨林和杨森,山林里的痕迹很脆弱,雾气、露水都可能破坏痕迹,一定要加快速度,但不能马虎,每一个细节都要记录到位。
    完成现场方位和概览的固定后,杨林和杨森开始进入外围痕迹搜索阶段。他们沿着警戒带内侧,以核心现场为中心,向外逐步扩展勘查范围,弯腰俯身,仔细查看地面上的每一寸土地、每一根杂草、每一块岩石。杨林手持多波段光源,开启蓝光模式,缓慢移动,蓝光下,潜在的汗液痕迹、灰尘足迹、微量纤维都会呈现出明显的荧光反应,便于识别。杨森则手持物证标识牌和粉笔,跟在杨林身后,一旦发现可疑痕迹,就立刻用粉笔圈画边界,放置标识牌,做好初步标记,同时在勘查笔录上记录下痕迹的位置、形态和初步特征。
    没过多久,杨林就在东侧巡山小径的入口处,距离核心现场约十五米的位置,有了发现。他停下脚步,示意杨森不要靠近,自己则蹲下身,用多波段光源仔细照射地面。地面上覆盖着一层薄薄的松针和泥土,松软的泥土上,清晰地印着一组成趟的灰尘足迹,一共有六枚,呈由东向西走向,步幅均匀,前掌压力面较大,后跟压痕清晰,没有明显的蹬踏痕迹,看起来像是有人沿着小径走进现场时留下的。
    杨林调整相机焦距,对这组足迹进行连续拍摄,每一枚足迹都拍摄了方位、概览、细目三张照片,细目照片中垂直放置了比例尺,精准记录下足迹的长度、宽度、花纹细节和磨损特征。“陆队,发现一组成趟灰尘足迹,长度约二十八厘米,鞋印花纹是不规则的块状纹路,不是常见的劳保鞋或运动鞋花纹,初步判断是户外登山鞋或者工装靴留下的,走向是从东向西,应该是作案人进入现场时留下的。”杨林一边拍摄,一边向陆川汇报。
    陆川走到近前,弯腰查看足迹,眉头微微蹙起:“仔细提取,看看能不能从足迹中提取到更多信息,比如作案人的身高、体型,还有鞋子的磨损程度,判断他的行走习惯。”杨森立刻拿出足迹提取剂,小心翼翼地喷洒在足迹表面,等待提取剂干燥后,用静电吸附器将足迹痕迹吸附下来,装入物证袋中,做好标记,注明发现位置和时间。
    两人继续向西勘查,在南侧灌木丛的边缘,距离尸体约八米的位置,杨森又发现了一枚孤立的立体足迹。这枚足迹陷入泥土约一厘米,周边的泥土有轻微的隆起,花纹和之前在小径入口处发现的成趟足迹完全一致,尺寸也相同,显然是同一个人留下的。“陆队,这里有一枚孤立立体足迹,和之前的成趟足迹一致,应该是作案人在现场停留时留下的,地面潮湿,足迹形态保存得比较完整。”
    杨林立刻凑过去,用软毛刷轻轻扫去足迹表面的松针和杂物,避免破坏足迹的纹理,然后用多波段光源照射,仔细观察足迹的深度和边缘状态,拍摄了多张细目照片。杨森则准备用石膏粉制作足迹模型,他先在足迹周围用泥土围起一个小圈,防止石膏液溢出,然后缓慢倒入调好的石膏液,一边倒一边轻轻晃动,确保石膏液填满足迹的每一个细节,随后在
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