Defendant-appellant Walter Caraballo-Cruz appeals his conspiracy conviction on double jeopardy grounds. His claim has merit. Consequently, we reverse.
*391 I
This appeal has its origins in an earlier case. In Mаy 1992, a federal grand jury charged appellant with conspiracy to possess 29 kilograms of cocaine, intending to distribute the drug, in violation of 21 U.S.C. §§ 841(a)(1) and 846. On July 16, 1992, a petit jury found him guilty as charged. The district court thereafter imposed sentеnce and we affirmed the judgment.
United States v. Caraballo-Cruz,
No. 92-2316,
Appellant’s travail was not limited to the 1992 indictment. On June 18, 1993, the grand jury returned a second, far broader indictment. The new indictment contained a master conspiracy count (count 1) and 47 subsidiary counts. The master conspiracy count charged 30. defendants, including appellant, with conspiracy to possess and distribute some 2,000 kilograms of cocaine in violation of 21 U.S.C. §§ 841(a)(1) and 846. Appellant, who was not indicted on any othеr charge, promptly moved to dismiss count 1. He asseverated that the master conspiracy portrayed therein encompassed the narrower conspiracy described in the earlier indictment, and, thereforе, that the government’s nascent attempt to prosecute him anew for his role in the master conspiracy transgressed the Double Jeopardy Clause.
On August 20, 1993, the district court denied appellant’s motion to dismiss without prejudice to its renewal at trial. 1 But no trial ever occurred. Instead, appellant entered into a conditional plea agreement in which he reserved his double jeopardy claim. The district court accepted а conditional guilty plea, Fed.R.Crim.P. 11(a)(2), and imposed sentence. On December 7, 1993, in accordance with the condition of his plea agreement, Caraballo-Cruz filed a notice of appeal.
II
The Fifth Amendment to the United States Constitution states in relevant part: “No person [shall] be subject for the same offence to be twice put in jeopardy of life or limb_” This constitutional shield embodies three separate safeguards: it proteсts against a second prosecution for the same offense after an acquittal; it protects against a second prosecution for the same offense after a conviction; and it protects against multiple punishments for the same offense.
See North Carolina v. Pearce,
While the appellant’s position is consistent and predictable, the government’s response is exotic. Even though the prosecution attempted to meet the double jeopardy initiative head-on before thе district court, its appellate brief is confined to a pair of peripheral issues. First, the government contends that we lack appellate jurisdiction because the double jeopardy issue was never decidеd on the merits by the court below. Second, it maintains that appellant’s guilty plea waived the issue. These assertions contain more growl than bite.
Ill
To guard against the constitutional insult that double jeopardy entails, a court fаced with a colorable successive prosecution claim must hear and determine the matter in advance of trial.
See United States v. Liotard,
The case at hand fits neatly within this doctrinal framework. Confronted with a timely motion to dismiss that limned a patently nonfrivolous successive prosecution claim, 2 the lower court denied the motion without prejudice to its renewal after the presentation of evidence at trial. See supra note 1. The Double Jeоpardy Clause prohibits such temporizing. And, moreover, inasmuch as the district court’s failure to decide the double jeopardy claim on the merits stemmed from the court’s mistaken view of the law rather than from any lack of diligence on appellant’s part, the government’s jurisdictional argument founders.
IV
The government’s waiver argument fares no better. Though an unconditional guilty plea typically subsumes all nonjurisdic-tional defects occurring earlier in -thе ease, insulating previous rulings from appellate review,
see United States v. Cordero,
With the approval of the court and the consent of the government, a defendant may enter a conditional plea of guilty ..., reserving in writing the right, on appeal from the judgment, to review of the adverse determination of any specified pretrial motion.
Fed.R.Crim.P. 11(a)(2). The import of this rule is open and obvious: it is designed to “ensure careful attention to any conditional plea,” to “identify precisely what pretrial issues have been preserved for appellate review,” and to husband scarce judicial resources by permitting a defendant fully to litigate hoarded issues while at the same time lessening the burden on busy district courts and sparing the sovereign the expense of trial. Fed.R.Crim.P. 11 advisory committee’s note.
The agreement that led to appellant’s plea in this case makes reference to Rule 11(a)(2) and contains an express written reservation of the right to appeal from the denial of the motion to dismiss.
3
In short, it scrupulously follows the protocol required by the rule. Hence, the government’s execution of the agreement (by not one, but two, Assistant United States Attorneys) represented its considered acquiescence in the defendant’s right to hawk his double jeopardy defense on appeal notwithstanding his guilty plea.
See id.; see also United States v. Ramos,
Should any doubt remain — and wе see none — the Supreme Court’s opinion in
Doggett v. United States,
— U.S. -,
Y
In its opposition to the appellant’s motion to dismiss in the district court, the government attempted to parse the factors required to determine when successive conspiracy counts should be construed as charging the same offense for purposes of double jeopardy analysis.
See, e.g., United States v. Cloutier,
We believe it is apodictic that “issues adverted to in a perfunctory manner, unaccompanied by some effort at developed argumentation, are deemed waived.”
United States v. Zannino,
On this record, then, we must hold the government tо its default and credit appellant’s argument that the two conspiracies constitute one and the same offense.
*394 VI
We need go no further. Appellant fully-preserved his defense of double jeopardy, and the govеrnment has articulated no credible reason to suppose either that the charged crimes are constitutionally distinct or that the defense is otherwise flawed. Consequently, the judgment of conviction must be
Reversed.
Notes
. The court acknowledged that the issue was nonfrivolous but declined to decide it "without having the benefit of the evidence that will be presented against the defendant at trial.” The court noted that, depending on what the trial disclosed, “a renеwed request [for dismissal] may prosper.”
. While we need not reach the merits of the double jeopardy claim, see infra Part V, that claim has much to commend it: both indictments charged the defendant with violating the same statutes; the describеd conspiracies overlapped temporally (the first indictment charged a conspiracy taking place in May 1992, whereas the second indictment charged a conspiracy running from September 1991 to March 1993); the five purported coconspirators identified in the first indictment were among those named in the second indictment; both conspiracies involved importing cocaine from Colombia into Puerto Rico; and in both instances contraband was destined for transshipment
. After referencing Rule 11(a)(2), the plea agreement stated that "this plea is conditioned upon defendant's reserving the right to appeal the Order denying defendant’s motion to dismiss the indiсtment on double jeopardy grounds.”
. The government's reliance on
United States v. Broce,
