Fable
The yamen established two new sets of case-review procedures: one looked at the consequences of a ruling, the other at the rules for keeping the case files.
During the Tianhe era, each prefecture tried out a bronze judgment mirror that could draft verdicts for judicial officials based on old cases. The Court of Judicial Review ordered that two volumes be submitted before the mirror was opened. Most prefectures and counties found this troublesome, so they wrote both volumes as "Use the bronze mirror with caution; keep the key with a designated person," and hastily submitted them. Some clerks did not understand, thinking that since both were meant to prevent trouble, one combined volume should be enough. Shen Heng, however, worried that once combined into one, the questions that most needed to be pressed would be covered up by elegant phrasing.
Shen Heng, the prefectural judge of Qingzhou, did not copy it directly. He first tested the bronze mirror in three types of cases: land disputes, commercial debt disputes, and marital property division. He found that in certain widow inheritance cases, the bronze mirror often followed old rulings that favored the clan; and out-of-town merchants whose accents were recorded vaguely by the clerk were also more likely to be disadvantaged. Shen Heng wrote a separate volume on these people's circumstances, remedies after misjudgment, appeal windows, and deactivation conditions. His first draft was also insufficient. It only listed case types, without writing who would be misjudged and how they could appeal. The Court of Judicial Review returned the volume, requiring that affected persons, remedy deadlines, and deactivation conditions be clearly stated.
In the second volume, he examined the case files themselves. Which files could be shown to the bronze mirror, which names had to be masked, which medical records, family letters, and child testimony could not be shared; when the copyist took the files, how many days until return, who could browse them—all had to leave a trace. The file review also went through rework. After masking the names, Shen Heng found that place names, family birth order, and rare disease names could still point back to the person, so he had to keep weakening the clues.
The neighboring prefecture submitted only a volume of fine words, and three months after opening the mirror trouble broke out: the bronze mirror did not leak records, but it pushed several groups of people toward heavier consequences; at the same time, the names in old cases were pieced together from torn pages by teahouse storytellers. Both matters were serious, but they were not the same kind of error.
Later, when the grand court reviewed the files, it first asked whether the two ledgers each had their own owner. If the same person wrote only one line, "be cautious," it was sent back for rework. Because the harm paths were different, the investigation methods, remediation owners and shutdown conditions were also different.
The Grand Court later made the rules clear: one volume asked how new instruments would change people and affairs; the other asked where the case files came from, how they would be used, and whether they would leak out. The former looked at consequences and responsibility, the latter at materials and boundaries. If either volume was missing, the bronze mirror could not be opened.