Talmudic law (Mishneh Torah, Sanhedrin 9:1) holds that a unanimous guilty verdict in a capital case acquits the defendant

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Maimonides' codification of Sanhedrin procedure (Mishneh Torah, Laws of the Sanhedrin 9:1) states a rule that inverts the usual intuition about corroboration. In Eliyahu Touger's translation, carried on Sefaria: "When all the judges of a Sanhedrin begin their judgment of a case involving capital punishment and say that the defendant is liable, he is exonerated. There must be some who seek to exonerate him and argue on his behalf, but yet the majority hold him liable. Only then he is executed." Ordinarily more agreement means a stronger verdict; here, total agreement is disqualifying.

The traditional reasoning is procedural rather than mystical. A Sanhedrin trying a capital case is required to argue both sides before condemning — the court has an affirmative duty to consider grounds for acquittal, and a guilty verdict must not be rendered same-day (a night's delay is built in so a judge might yet think of a defense). If every judge votes to convict, the rule treats this as proof that no one actually made the defense's case — either through collusion or through a structural failure to argue the required dissent. Unanimity is read as a symptom that the deliberative process itself broke down, not as stronger evidence of guilt.

This is a legal-procedural instance of the same shape as Fisher's statistical suspicion of too-good-a-fit and Simonsohn's fabrication forensics: perfect agreement, whether in judicial votes or in experimental data, is read as a signature of a missing independent check rather than as confirmation. It belongs to the vault's legal-epistemology cluster alongside claim-roman-canon-law-rated-one-witness-equal-to-a-private-document and claim-whitman-reasonable-doubt-began-as-juror-soul-protection. See observation-suspicious-perfection-independence-absence-signals-defect for the general law.

Correction history.

• 2026-09-05 — Quote corrected against the primary; doctrine unchanged. This note previously carried, and quoted twice, the wording "In a Sanhedrin where all judges saw fit to convict a defendant in a capital case, they acquit him." — sourced (per the 2026-07-11 hop) only to a WebSearch summary, never to a direct read. The 2026-09-01 batch capture fetched the Sefaria primary directly (via its /api/texts/ endpoint; source_sha 1eedf77a…) and found the top-priority English version — Eliyahu Touger's Moznaim translation — reads differently: "When all the judges of a Sanhedrin begin their judgment of a case involving capital punishment and say that the defendant is liable, he is exonerated. There must be some who seek to exonerate him and argue on his behalf, but yet the majority hold him liable. Only then he is executed." The rule is the same in substance; the wording is materially different. The source_quote, body quotation, and tier (3→2) have been updated to the Touger/Moznaim text. The provenance of the earlier wording remains unlocated — it matches no primary translation read this session — and is left as a minor open thread rather than a routed question, since the load-bearing doctrine is now sourced to a named primary. Found in the promotion of the 2026-09-01 suspicious-perfection verification capture.