Check out the Ninth Circuit's decision in U.S. v. Chapman for a sharp rebuke of the government, including the affirmance of a district court's dismissing an indictment with prejudice — thus barring retrial — because of government misconduct:
The district court did not abuse its discretion in dismissing the indictment. The government egregiously failed to meet its constitutional obligations under Brady and Giglio. It failed to even make inquiry as to conviction records, plea bargains, and other discoverable materials concerning key witnesses until after trial began. It repeatedly misrepresented to the district court that all such documents had been disclosed prior to trial. The government did not admit to the court that it failed to disclose Brady/Giglio material until after many of the key witnesses had testified and been released. Even then, it failed to turn over some 650 documents until the day the district court declared a mistrial and submitted those documents to the court only after the indictment had been dismissed. This is prosecutorial misconduct in its highest form; conduct in flagrant disregard of the United States Constitution; and conduct which should be deterred by the strongest sanction available. Under these facts, the district court did not abuse its discretion in characterizing these actions as flagrant prosecutorial misconduct justifying dismissal. Nor did it abuse its discretion in determining that a retrial — the only lesser remedy ever proposed by the government — would substantially prejudice the defendants.
And from earlier in the opinion:
We are similarly troubled, both by the AUSA's actions at trial and by the government's lack of contrition on appeal. The government attorneys who appeared in the original AUSA's stead on the critical day of the hearing on the motion to dismiss the indictment told the trial court that they "took this matter extremely seriously" and conceded that the government made a "very serious mistake in terms of [its] discovery obligations." Before us, however, these same attorneys have attempted to minimize the extent of the prosecutorial misconduct, completely disregarding the AUSA's repeated misrepresentations to the court and the failure to obtain and prepare many of the critical documents until after the trial was underway. Instead, they claim for the first time on appeal that none of the 650 pages were required disclosures under Brady/Giglio. When the district court first indicated that it was inclined to dismiss the indictment, it noted that it was "concerned [that] any lesser sanction [would be] like endorsing [the AUSA's conduct]." The government's tactics on appeal only reinforce our conclusion that it still has failed to grasp the severity of the prosecutorial misconduct involved here, as well as the importance of its constitutionally imposed discovery obligations. Accordingly, although dismissal of the indictment was the most severe sanction available to the district court, it was not an abuse of discretion.
By the way, note that the panel decision was unanimous, and that the panel consisted of two moderate Clinton appointees (Judges Wardlaw and Hawkins) and a quite conservative Reagan appointee (Judge O'Scannlain).