Felix Frankfurter,
Di Bella v. United States — Opinion of the Court
“ When at the time of ruling there is outstanding a complaint, or a detention or release on bail following arrest, or an arraignment, information, or indictment-in each such case the order on a suppression motion must be treated as 'but a step in the criminal case preliminary to the trial thereof.' Cogen v. United States, 278 U.S. 221, 227, 49 S.Ct. 120. Only if the motion is solely for return of property and is in no way tied to a criminal prosecution in esse against the movant can the proceedings be regarded as independent. ”
