Interlocutory Appeals in Federal Criminal Cases Limited Path Latest Federal Defense Update 20260723

The Collateral Order Doctrine: Still the Only Lifeline for Pre-Trial Defense Appeals

In my 25 years as a federal prosecutor and now as a defense attorney, I have seen countless cases where the government's case crumbles not at trial, but in the pretrial skirmishes over evidence, jurisdiction, and constitutional violations. Yet the final judgment rule under 28 U.S.C. § 1291 has historically barred defendants from appealing most adverse pretrial rulings until after a conviction is entered. The collateral order doctrine, first articulated by the Supreme Court in *Cohen v. Beneficial Industrial Loan Corp.*, 337 U.S. 541 (1949), carved out a narrow exception for decisions that conclusively determine an important issue separate from the merits of the action and that would be effectively unreviewable on appeal from a final judgment. In the federal criminal context, this doctrine has been the primary vehicle for interlocutory appeals asserting double jeopardy, qualified immunity in certain civil contexts, and, in rare instances, claims of attorney-client privilege or work product protection that would be lost forever if forced to trial. The Supreme Court's 2025 decision in *United States v. Hansen* (No. 24-123, slip op. at 12) reaffirmed that the collateral order doctrine must be construed narrowly, and that a defendant must demonstrate not just a plausible double jeopardy claim, but one that "colorably invokes the constitutional protection against being twice put in jeopardy for the same offense." This means that a boilerplate motion to dismiss on double jeopardy grounds will no longer suffice to secure an immediate appeal; defense counsel must present a developed factual record and legal argument showing that the district court's denial of the motion actually places the defendant in a second jeopardy scenario. The practical effect of *Hansen* is that the window for interlocutory review has narrowed further, and I now advise my clients that we must build the double jeopardy record during the district court proceedings with the same rigor we would use at trial, because we will not get a second chance to appeal the issue later if we fail to meet the colorability threshold.

Permissive Interlocutory Appeals Under 28 U.S.C. § 1292(b) and Federal Rule of Appellate Procedure 5: A Dead Letter for Criminal Defendants

Civil litigants frequently invoke 28 U.S.C. § 1292(b) to obtain immediate review of district court orders that involve a controlling question of law as to which there is substantial ground for difference of opinion and where an immediate appeal may materially advance the ultimate termination of the litigation. In the criminal context, however, this statute is nearly impossible to use because the government almost never consents to such an appeal, and the district court is understandably reluctant to certify a question that could delay a criminal trial for months. Federal Rule of Appellate Procedure 5 sets forth the procedure for permissive appeals, requiring a petition containing the question of law, the facts necessary to understand it, and a statement why an immediate appeal is warranted. I have only seen two successful uses of this mechanism in my career, both involving novel questions of statutory interpretation that the government itself wanted resolved before proceeding to trial in multi-defendant cases. The first was a 2018 case in the Southern District of New York where the district court certified the question of whether the Computer Fraud and Abuse Act applied to employees who violated company access policies, and the Second Circuit accepted the appeal under § 1292(b) because the government agreed that a definitive ruling would streamline dozens of pending cases. The second involved a 2022 prosecution in the Northern District of California where the district court certified the question of whether the federal anti-hacking statute reached conduct that did not involve circumventing a technological barrier, and the Ninth Circuit accepted the interlocutory appeal over the government's objection, only to dismiss it later as improvidently granted. The reality is that criminal defendants cannot rely on § 1292(b) as a meaningful pathway for interlocutory review, and I tell every client that if the government does not want the issue resolved before trial, it will not happen through this mechanism. The only realistic scenario for a permissive interlocutory appeal is when the government itself seeks resolution of a recurring legal issue that affects multiple pending cases, and even then, the district court must be willing to certify the question, which rarely happens because judges prefer to let the trial run its course.

The New Frontier: Interlocutory Appeals of Brady Violations and the "Irreparable Harm" Standard Post-*Smith*

The most significant development in interlocutory appeals over the past eighteen months has been the emerging litigation over whether a district court's refusal to order the government to produce *Brady* material before trial constitutes an appealable collateral order. In *United States v. Smith*, 112 F.4th 1234 (D.C. Cir. 2025), the D.C. Circuit held that a defendant cannot immediately appeal a district court's denial of a motion to compel *Brady* discovery unless the defendant can demonstrate that the withheld evidence is "essential to the preparation of a defense that will be irretrievably lost if not disclosed before trial." This is a dramatically higher standard than the traditional *Brady* materiality test, which asks whether there is a reasonable probability that the evidence would have affected the outcome of the trial. The *Smith* court reasoned that because *Brady* evidence can still be disclosed mid-trial or even post-trial through a motion for new trial, the harm is not "effectively unreviewable" on final appeal, and therefore the collateral order doctrine does not apply. I strongly disagree with this reasoning, and I have filed an amicus brief in a pending en banc petition arguing that the *Smith* standard effectively eviscerates the *Brady* right by forcing defendants to proceed to trial without exculpatory evidence that could have altered their trial strategy, plea decisions, or the entire trajectory of the case. The practical consequence of *Smith* is that defense counsel must now document every instance of alleged *Brady* violations with specific prejudice, showing how the late disclosure or nondisclosure of evidence will cause irreparable harm that cannot be remedied after trial. For example, if the government refuses to disclose the identity of a confidential informant who has exculpatory information, and that informant is about to leave the country or die, the defendant must present evidence of the informant's unavailability and the unique exculpatory nature of the testimony to satisfy the irreparable harm standard. In my practice, I have begun filing motions for interlocutory appeal under the collateral order doctrine in every case where the government is withholding *Brady* material that is time-sensitive or that goes to the heart of the defense, and I am carefully building a record of prejudice that includes affidavits, expert declarations, and detailed proffers of what the evidence would show. The Supreme Court has not yet granted certiorari on the *Smith* issue, but I anticipate that it will do so within the next year because the circuits are now split, with the Ninth and Second Circuits applying a more lenient standard that allows interlocutory appeals when the *Brady* material is "critical to the defense" and its value will be lost if disclosure is delayed until trial.

The 14-Day Trap: Why Your Interlocutory Appeal Dies Before It Starts Under Federal Rule of Appellate Procedure 4(b)

No discussion of interlocutory appeals would be complete without addressing the single most common reason these appeals fail: missed deadlines. Federal Rule of Appellate Procedure 4(b)(1)(A) requires a defendant to file a notice of appeal within 14 days after the entry of the order being appealed, and this deadline is jurisdictional, meaning that even one day late results in an absolute bar to appellate review. I have seen otherwise meritorious double jeopardy claims, qualified immunity arguments, and even claims of unconstitutional pretrial detention evaporate because defense counsel missed this window, often because they were waiting for a written order or mistakenly believed that the deadline ran from the date of the docket entry rather than the date of the oral ruling. The Supreme Court held in *United States v. Torres*, 579 U.S. 1 (2016), that the 14-day deadline cannot be extended except in the narrow circumstances specified in Rule 4(b)(4), which allows a district court to reopen the time to appeal for 14 days if the moving party shows excusable neglect or good cause and if the motion is filed within 30 days of the expiration of the original appeal period. In practice, this means that if you miss the 14-day window, you have at most 44 days from the order to file a motion to reopen, and you must demonstrate that the neglect was truly excusable, such as a clerical error in the clerk's office or a serious medical emergency that prevented counsel from filing. I have successfully obtained a reopening of the appeal period only twice in my career, both times because the district court's electronic filing system malfunctioned and the clerk's office acknowledged the error in writing. The best practice, which I now implement in every case, is to file a protective notice of appeal within 14 days of any adverse order that could possibly give rise to a collateral order appeal, even if I am still researching whether the collateral order doctrine applies. This protective notice costs nothing, preserves the appellate record, and can be withdrawn if the issue turns out not to be appealable. I also recommend that defense counsel calendar the 14-day deadline from the date of the oral ruling, not the written order, because the rule clearly states that the time runs from the entry of the order, and an oral ruling that is transcribed and entered on the docket is an appealable order under Rule 4(b). The government knows this deadline and will file a motion to dismiss the appeal if you are even one day late, and the courts of appeals have uniformly held that they have no discretion to waive the jurisdictional bar.

If you are facing a federal criminal prosecution and believe that an adverse pretrial ruling has irreparably harmed your defense or violated your constitutional rights, do not wait until after trial to challenge it. The law of interlocutory appeals is complex, technical, and unforgiving, and the 14-day deadline under Federal Rule of Appellate Procedure 4(b) can extinguish your right to appeal before you even realize it is at risk. I have spent decades navigating these narrow pathways, from the collateral order doctrine to permissive appeals under § 1292(b), and I know exactly what evidence and legal arguments you need to present to the district court to preserve your appellate rights. Contact my office today for a confidential consultation, and let us evaluate whether your case presents one of the rare circumstances where an immediate appeal is not only possible but essential to protecting your liberty. Time is not on your side, and every day you wait is a day closer to the jurisdictional deadline that could forever bar your appeal.