The defendant in State v. Greenfield, No. COA23-597 (N.C. Ct. App. Feb. 19, 2025), argued the trial court erred by admitting evidence and allowing argument about an attempted armed robbery charge for which he had previously been acquitted. The Court of Appeals posited that evidence is inadmissible under the Double Jeopardy Clause only when it falls within the scope of the collateral estoppel doctrine, which precludes relitigation of an issue of fact previously determined by a final judgment. The Court of Appeals concluded that the trial court did not err by failing to intervene in the closing argument here, but its formulation of the rule begs the question: under what circumstances will double jeopardy require the exclusion of evidence? This post attempts to answer that question.