John Marshall Harlan II,
United States v. Sisson — Opinion of the Court
“ We construe the Criminal Appeals Act as confining the Government's right to appeal-except for motions in arrest of judgment-to situations in which a jury has not been impaneled, even though there are cases in which a defendant might constitutionally be retried if appeals were allowed after jeopardy had attached. Because the court below rendered its decision here after the trial began, and because that decision was not, as we have shown, an arrest of judgment, we therefore conclude there can be no appeal under the other provisions of § 3731. ”
