The Uniform Code of Military Justice gives a convening authority the "sole discretion" to reduce or set aside guilty verdicts and sentences, or to reverse a jury's verdict.

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"We conclude that the district court did abuse its discretion when it denied the motion to sever (Stewart's trial from Simpson's) because it prejudiced Stewart by having a substantial and injurious effect on the verdict, and we therefore reverse the judgment of conviction, " the court wrote.

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