Officials are looking for fingerprints, DNA, hair, surveillance video clues, anything that could help identify the sender.

官员正在寻找指纹、DNA、毛发、监控录像等一切有助于识别寄件人身份的线索。

Investigators can use something called a DNA fingerprint to profile based on information from 13 DNA regions.

调查人员可以使用来源于13 个DNA区域一种名为DNA指纹档案信息。