Greer v. United States, 593 U.S. 503 (2021), was a United States Supreme Court case in which the Court held that an unobjected-to failure to instruct the jury that the defendant must have known they were a felon is not structural error requiring reversal. Moreover, it would be difficult to show plain error because "convicted felons ordinarily know that they are convicted felons." The case was consolidated with United States v. Gary; Sotomayor dissented to the court's assessment of Gary.
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