第1741章 扩大现场勘察范围

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    “尤其是尤其是鞋子和衣着。”陆川看了眼手表,早上七点十五分,距离发现尸体已经过去两个小时,太阳正慢慢爬过养殖场的屋顶,把一切都照得清清楚楚,包括那些隐藏在猪粪和淤泥里的痕迹。
    陆川的鞋子在养殖场的冻土上磕出脆响,他转身时,围巾上的猪粪渣簌簌落在“进一步勘查范围”的示意图上。“以第三圈猪圈为中心,向东西各扩50米,南北各扩30米,”他的笔尖在图上划出矩形框,“重点查围栏衔接处,
    饲料仓库后墙、还有那排废弃的消毒池,任何异常痕迹都别放过。”寒风卷着猪的嚎叫声掠过,杨林正把多波段光源的电池塞进保温袋,避免低温影响光谱稳定性。
    杨森已经在饲料仓库的铁皮屋顶上架起了勘查灯,光束穿透结霜的玻璃窗,在麻袋堆里投下斑驳的光影。“林哥,你看这地面的粉尘,”他用静电吸附器贴近地面,黑色的胶板上立刻粘起几片银白色的金属屑,“X射线荧光光
    谱仪测过,含铅量37%,锌63%,是焊锡的成分,这仓库平时只堆饲料,不该有这东西。
    “
    杨林正跪在猪圈的水泥台边缘,多波段光源的蓝紫光扫过墙角的裂缝。“拖拽痕迹的纤维密度在1.2米处突然增大,”他用镊子夹起一缕深蓝色的聚酯纤维,放在载玻片上,“经纬密度120x80根/英寸,和死者工装的密度一
    致,但捻度更高,像是被大力撕扯过。”他让技术人员在裂缝深处取样,石膏模型显示这里有枚残缺的指纹,纹线流向与成年男性的右手拇指吻合。
    “仓库后墙有新鲜的攀爬痕迹,”杨森的喊声从东边传来,他正用激光测距仪测量墙高,“2.3米,墙面的水泥被蹭掉了2x3厘米,露出的红砖上有枚44码鞋印,前掌压力区偏外,符合左撇子攀爬时的发力特征。”墙根的枯草
    里,有个被踩扁的烟盒,“红塔山,烟蒂的滤嘴上有淡淡的薄荷味,DNA检测需要回去做,但烟丝的燃烧程度显示是昨晚10点左右抽的。
    杨林的注意力集中在废弃消毒池里,池底的积水结着薄冰,冰面下有个模糊的阴影。“把抽水机拿来,”他用冰锥凿开冰层,“这形状像是根钢管,长度大概80厘米。”抽水机轰鸣着把水排进排水沟,露出的钢管表面沾着暗红
    色的斑迹,用联苯胺试剂测试后,呈现出阳性反应??可能是血迹。钢管的一端有明显的痕迹,边缘卷曲,与围栏插销上的凹痕形态吻合。
    “饲料仓库的锁芯是‘美利保‘C级锁,”杨森蹲在挂锁前,放大镜下的弹子有被撬动的新鲜划痕,“但不是暴力破解,像是用了万能钥匙,锁芯里的黄铜粉末成分,和养殖场办公室抽屉锁里的一致,说明钥匙可能是内部人员配
    的。”他突然指向仓库角落的秤,“这台磅秤的显示屏还亮着,最后一次称重记录是昨晚9点47分,238公斤,比平时的饲料重量多了50公斤。
    “
    杨林在消毒池旁的泥地里有了新发现。“这串足迹有交替性跛行特征,”他用标尺卡着44码劳保鞋的印记,“左足跟的压力面比右足小30%,像是左腿有旧伤。”足迹延伸到围栏外的柏油路,在路边的排水沟里消失,“鞋印边
    缘的泥土含沙量突然增加,说明从这里开始换了交通工具,排水沟壁有轮胎擦痕,宽度18厘米,符合摩托车的胎宽。
    “
    “林哥,你看这根棕色鞋带,”杨森举着证物袋跑过来,袋里的鞋带末端有烧焦的痕迹,“在饲料仓库的麻袋缝里找到的,纤维成分和围栏木板里的完全一致,但灼烧痕迹的热变形方向是从左到右,像是被打火机点着过。”他突
    然想起什么,“死者的工装鞋是黑色鞋带,这根明显不是他的,很可能是凶手掉落的。”
    勘查进行到中午,阳光终于驱散了部分寒气。杨林把所有样本分类装箱时,杨森正在汇总异常点:“焊锡屑、攀爬痕迹,带血的钢管、跛行足迹、燃烧的鞋带....这些线索能串起来,但缺个关键的连接点。”他调出养殖场的卫
    星图,“你看,从仓库后墙到第三圈猪圈,有条直线距离15米的隐蔽路线,正好避开所有监控盲区,凶手对这里的地形太熟悉了。”
    杨林的目光落在那台磅秤上,显示屏的数字还停留在238公斤。“正常饲料每袋50公斤,238公斤是四袋多,”他突然皱起眉,“但仓库里的麻袋都是满的,没少数量,这多出来的50公斤是什么?”他让技术人员拆开最近的
    麻袋,饲料里混着几根灰白色的猪毛??与第三圈猪的毛发DNA一致,但毛囊已经脱落,像是被故意掺进去的。
    “围栏的金属网有处30厘米的缺口,”杨森在西边喊道,他用光谱仪检测缺口边缘,“氧化层断裂时间不超过12小时,上面的纤维是聚丙烯材质,常用于编织袋,和收
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