paper audit trail[审计] 书面审计线索
Voter Verified Paper Trail选民验证纸质记录
N-SING（单数型名词） Documents that provide evidence of someone's activities can be referred to as a paper trail. 个人文档 [美国英语]
Criminals are very reluctant to leave a paper trail.
罪犯们非常不愿意留下案底。