The government in this pending criminal case has appealed as is its right from an order by the district judge excluding certain evidence that the government
*813
wanted to present at trial. 18 U.S.C. § 3781. Believing that the judge intended to go ahead and select (though not swear in) the jury despite the pendency of the appeal, the government has filed a motion with this court to stay the judge’s hand till the appeal is resolved. We have granted the motion and now explain our reasoning. As a preliminary matter, we note with disapproval the defendants’ motion to dismiss the appeal. Section 3731 requires, in appeals authorized by the second paragraph of the section, as this one is, that the U.S. Attorney certify that the appeal is substantial and not taken for purposes of delay. The U.S. Attorney did so certify, and since the Solicitor General must in any event approve federal government appeals, there is no significant danger that the appeal will be frivolous, warranting dismissal rather than disposition on the merits (affirmance or reversal). Furthermore, Paragraph 2 appeals are usually from orders suppressing or excluding evidence, and there is no basis on which, in advance of trial, we could determine that the evidence that the government wished to use was so unimportant to any rational prose-cutorial strategy that the appeal was frivolous. We therefore treat as conclusive of our jurisdiction over a Paragraph 2 appeal the submission of the certification required by the statute. That is the view of this court, and of the other circuits except the Ninth.
United States v. Jarrett,
The government argues that the filing of a notice of appeal automatically divests the trial court of jurisdiction over the case, but this is overbroad. As we explained in
United States v. Ienco,
Section 3731 requires the government, in appeals based on the second paragraph of the section (appeals from orders “suppressing or excluding evidence or requiring the return of seized property in a criminal proceeding”), to file the notice of appeal before jeopardy attaches to the defendant. In a jury trial that occurs when the jury is sworn; and courts have ruled that the filing of the notice of appeal bars the district court from proceeding to the swearing in of the jury, lest by doing so the court make it difficult for the government to obtain relief (for example, that the trial start over again with the evidence whose exclusion had been challenged by the appeal). E.g.,
United States v. Brooks,
