第1886章 现场勘察的线索

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    地面上满是车轮碾压的痕迹,杂乱无章,很难分辨出有效线索。杨森则蹲在压缩站的排污口旁,用镊子拨开堆积的淤泥,突然眼睛一亮。你看这个!
    镊子夹着一小块黑色塑料碎片,边缘有明显的切割痕迹,材质与包裹尸体的黑色塑料袋完全一致。碎片上沾着少量暗红色污渍,还有几根褐色纤维。杨森将碎片装进证物袋。污渍看起来像是干涸的血迹,但在排污口泡了这
    么久,能不能检测出来还不好说。纤维质地粗糙,像是某种布料,说不定是死者衣物上的,或者是嫌疑人身上的。
    杨林凑过来仔细观察。塑料碎片的切割面很整齐,不像是被垃圾车碾压断裂的,更像是嫌疑人包裹尸体时,不小心割破塑料袋掉下来的。咱们顺着排污口的方向再找找,看看还有没有其他碎片。两人沿着排污口的沟渠往前走
    了约20米,又发现了两块类似的黑色塑料碎片,其中一块上还沾着少量水泥碎屑,与之前在尸体塑料袋上发现的水泥碎屑成分一致。
    看来嫌疑人确实在这附近停留过,这些塑料碎片应该是他处理塑料袋时遗留的。杨林在笔记本上标注出发现碎片的位置。但这里的车轮印太乱了,根本分不清哪辆是嫌疑人的车,只能确定嫌疑人可能熟悉压缩站的运作时间,
    特意选在没人的时候抛尸。
    品
    随后,两人转向北侧的围墙角落。围墙高约2.5米,墙面斑驳,布满了涂鸦,墙根下堆积着废弃的木板和破旧家具,是整个垃圾场最隐蔽的区域。杨森用探杆拨开一堆废弃床垫,突然传来叮的一声轻响。探杆碰到了金属物
    两人小心翼翼地将床垫挪开,地面上躺着一枚银色金属纽扣,直径约1.5厘米,表面有磨损痕迹,边缘刻着模糊的花纹。纽扣材质是黄铜镀金,看起来有些年头了,不像是新衣服上的。杨林将纽扣装进证物袋。在纽扣旁边的
    泥土里,还发现了半脚印,是43码男士运动鞋印,和之前在尸体东侧发现的鞋印特征一致!
    脚印只有前半部分,脚趾处的纹路清晰可见,沾着的泥土中混杂着少量红色油漆颗粒。与尸体塑料袋上的红色油漆斑点成分相同。这说明嫌疑人确实从围墙根下走过,而且很可能在这里停留过。杨森用标尺测量脚印的深度。
    脚印陷进泥土约1厘米,结合泥土的湿度,推测留下时间在24-48小时内,与我们推测的抛尸时间基本吻合。
    沿着围墙根继续排查,在一处破损的排水孔旁,杨林发现了一根烟蒂。烟蒂品牌为红塔山,过滤嘴上有明显的齿痕,表面还沾着少量灰色粉尘。那是垃圾场特有的灰尘。烟蒂上应该有嫌疑人的唾液,虽然在外面暴露了这么
    久,但技术科说不定能提取到DNA。杨林将烟蒂装进专用的DNA采集袋。而且烟蒂的燃烧程度显示,嫌疑人只抽了不到三分之一就扔了,可能是因为紧张,或者听到了什么动静,匆忙离开。
    杨森则在排水孔内侧,发现了一根细长的金属丝,弯曲成钩状。金属丝材质是铁丝,表面有铁锈,一端磨得很锋利。他用镊子夹起金属丝。看起来像是被人刻意打磨过,可能是嫌疑人用来撬开围墙门锁的工具,也可能是用来
    勾取垃圾掩盖尸体的。不过排水孔很小,金属丝怎么会掉在这里,有点奇怪。
    两人继续扩大勘查范围,在废弃分拣区的传送带旁,又有了新发现。传送带早已停止运作,表面覆盖着一层厚厚的灰尘,在灰尘中,杨森发现了几处浅浅的划痕,划痕方向一致,像是被某种硬物拖拽造成的。划痕边缘有黑色
    塑料残留,和包裹尸体的塑料袋材质一致。杨森用强光勘查灯照射划痕。而且划痕长度与尸体的长度相近,说不定嫌疑人曾在这里短暂停留,将尸体放在传送带上,再转移到抛尸点。
    在传送带下方的储物箱里,杨林还找到了一张被揉成团的纸巾,纸巾上沾着少量褐色污渍和几根短发。短发颜色为黑色,长度约5厘米,发质较软,可能是死者或嫌疑人遗留的。杨林将纸巾展开,小心地装进证物袋。污渍和
    之前在塑料碎片上发现的暗红色污渍颜色相近,需要回去一起检测,看看是不是同一来源。
    不知不觉间,两人已经勘查了近3个小时,收集到的证物袋在勘查包里堆了小半。杨森靠在围墙上,摘下防毒口罩透了口气,语气里带着一丝疲惫。虽然找到了塑料碎片、纽扣、烟蒂这些东西,但还是没什么能直接指向嫌疑
    人身份的线索,死者是谁也依旧不清楚。你说,那枚金属纽扣和链条会不会是死者随身携带的饰品?比如腰带扣或者钱包上的零件?
    杨林也摘下口罩,揉了揉发酸的脸颊。有可能,但纽扣上没有任何标识,链条也只有一小段,很难通过这些确定死者身份。而且烟蒂和纸巾上的DNA能不能提取出来还是个问题,垃圾场的环境太复杂,污染物太多
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