为此，实验室会将证物和保管在柜子中的样本做比较。
For this purpose, the laboratory compares its evidence to samples maintained in archives.
因为被送到实验室的证物很难保存易于辨认的部位，更不可能是整只动物，科学家们必须从一些碎片中辨认物种。
Because evidence sent to the lab rarely contains easily recognizable parts, much less a whole animal, the scientists must work to identify species from limited fragments.
因此，有的时候从证物上获得的DNA分析结果可能与任何一个嫌疑人的检测结果都不匹配，在罪犯DNA数据库中也找不到相匹配的结果。这样的问题每个法医室都会遇到。
Hence, every forensic lab is confronted with cases where the DNA profile obtained from the evidence material does not match that of any known suspect tested, nor anybody in the criminal DNA database.
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