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Why is the prosecution generally unable to appeal an acquittal in Anglo-American law?

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Mosaic portrait of Emperor Justinian I with a jeweled crown and halo, from the 6th-century Basilica of San Vitale in Ravenna, Italy. — Procedural law Justinian I, detail of a 6th-century mosaic at the Church of San Vitale, Ravenna, Italy.

In Anglo-American legal systems, the prosecution is generally unable to appeal an acquittal due to the principle of double jeopardy.2

This fundamental legal protection prevents the state from subjecting an individual to multiple prosecutions for the same offense based on the same conduct. Because the rule of double jeopardy forbids a defendant from being tried twice for the same act, an acquittal serves as a final determination that bars the government from initiating a new trial or seeking to overturn the verdict through an appeal.12

While defendants are granted a liberal right to seek appellate review to challenge the legality of a conviction, the state’s power is constrained in this regard to protect citizens from the potential overreach of the judicial system and to ensure the finality of an acquittal.32