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

Maimonides' codification of Sanhedrin procedure (Mishneh Torah, Laws of the Sanhedrin 9:1) states a rule that inverts the usual intuition about corroboration: "In a Sanhedrin where all judges saw fit to convict a defendant in a capital case, they acquit him." 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.