The rule of four holds that prosecutors are not permitted to keep evidence from the defendant and her or his attorneys that may be useful in showing innocence.

Question

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The rule of four is a principle used by the United States Supreme Court, stating that if four of the nine Justices agree to grant a writ of certiorari, a case will be heard. The principle mentioned in the question actually refers to the Brady rule, which requires prosecutors to disclose materially exculpatory evidence in the government's possession to the defense.

The Rule of Four Holds That Prosecutors Are Not Permitted