paper trail
noun/ˈpeɪpə treɪl/
/ˈpeɪpər treɪl/
(informal)- a series of documents that provide evidence of what you have done or what has happened
（揭示来龙去脉的）系列文件 - He was a shrewd lawyer with a talent for uncovering paper trails of fraud.
他是个精明能干的律师，能从一连串文件中找出诈骗的蛛丝马迹。
- He was a shrewd lawyer with a talent for uncovering paper trails of fraud.