This case presents yet another factual variation in the stream of Booker-related cases coming to this Court on plain error review. The defendant, Pete Magallanez, was convicted by a jury for conspiracy to possess with intent to distribute, and to distribute, methamphetamine in violation of 21 U.S.C. §§ 846, 841(a)(1). On special interrogatory, the jury attributed 50-500 grams of methamphetamine to him. At sentencing, however, the district court found 1200 grams of methamphetamine attributable to him and increased his sentence pursuant to the United States Sentencing Guidelines. Unlike our recent en banc decision in
United States v. Gonza
*677
lez-Huerta,
Before we reach the sentencing issues in this case, however, we must first address the defendant’s challenges to his conviction, which are predicated on certain alleged evidentiary errors and the insufficiency of the evidence.
I.
Law enforcement agents began investigating the “Moreno” drug ring in early 1999. The investigation included more than 100 interviews and the collection of numerous documents. These interviews and documents led the agents to believe that Mr. Magallanez was involved in the conspiracy. Mr. Magallanez was .charged with one count of conspiracy to possess with intent to distribute, and to distribute, methamphetamine in violation of 21 U.S.C. §§ 846, 841(a)(1). He received a jury trial.
During trial, the government called Kurt Dobbs, the Director of the Wyoming Division of Criminal Investigations, to testify about the general nature and scope of the investigation and about the developments that led to the arrest of Mr. Magallanez. The government also called DEA Special Agent Steve Woodson, who testified about his involvement in the investigation. Agent Woodson also testified as an expert with specialized knowledge on drug quantities and their prices in Wyoming. Several participants in the drug ring testified on behalf of the government and offered evidence that incriminated Mr. Magallanez. These latter witnesses had agreed to testify as part of plea agreements. The jury convicted Mr. Magallanez.
II.
Mr. Magallanez raises four issues on appeal of his conviction.
A.
First, Mr. Magallanez challenges admission of certain testimony by Agents Dobbs and Woodson. Agent Dobbs testified that information obtained from members of the Moreno drug ring, corroborated by documentation such as phone records and money transfers, led to the indictment of Mr. Magallanez. Agent Dobbs characterized the investigation as a typical conspiracy investigation. He explained that the investigation entailed obtaining evidence in “several different ways. One of the main, ways is interviewing people ... and tryfing] to corroborate what they say through ... other people’s ... interviews [or] paper[s].... ” Id.
Agent Woodson testified as to the street prices of methamphetamine, and explained the meaning of slang phrases that are commonly used by participants in a drug ring, but might not be familiar to those not participating. Agent Woodson also explained the value of phone records, motel records, and wire transfers in corroborating information obtained from .witnesses.
Mr. Magallanez argues that the testimony of Agents Dobbs and Woodson was irrelevant, violated the Confrontation Clause of the Sixth Amendment, and amounted to improper vouching for the credibility of the government’s witnesses. He objects in particular to Agent Dobbs’s testimony that “[t]he [evidence] that would *678 relate to the defendant is the documentation that corroborates or adds to the credibility of some of the people that gave us information about the defendant and the defendant’s involvement in the trafficking of methamphetamine.” R. Vol. 4 at 567. Although Mr. Magallanez does not cite any single statement of Agent Woodson as especially egregious, he argues that Agent Woodson testified in summary that the witnesses in this case were telling the truth.
Mr. Mallaganez did not challenge this testimony before the district court. We therefore review the admission of the evidence for plain error.
United States v. Walser,
Mr. Magallanez contends that the drug agents’ testimony regarding the historical background of the investigation that ultimately led to him was irrelevant to the charges against him. However, “a defendant cannot complain of error which he has invited upon himself.”
United States v. Cutler,
Mr. Magallanez argues that, even if the evidence is relevant, it is unfairly prejudicial. Federal Rule of Evidence 403 provides that “[a]lthough relevant, evidence may be excluded if its probative value is substantially outweighed by the danger of unfair prejudice.” “The trial court has broad discretion to determine whether prejudice inherent in otherwise relevant evidence outweighs its probative value.”
United States v. Youts,
Mr. Magallanez argues that the agents’ reliance on documents and interviews which were not introduced at trial negated his ability to confront his accusers and thus violated the Confrontation Clause of the Sixth Amendment. Specifically, Mr. Magallanez alleges that Agent Woodson testified in summary that “many other witnesses that were not called had said that the defendant was guilty and they were believable and he as an expert believed [them].” Appellant’s Br. at 17. Mr. Magallanez relies on
Crawford v. Washington,
We cannot find, and Mr. Magallanez does not identify, any out-of-court statement that can be characterized as testimonial. Rather, both agents testified as to the general nature of the investigation without introducing statements from drug ring participants. Mr. Magallanez therefore fails to establish any error on this point.
Mr. Magallanez also argues that the drug enforcement agents improperly vouched for the credibility of the witnesses. Specifically, he contends that the agents’ testimony that the documents corroborated the statements made by the witnesses vouched for the credibility of those witnesses. This claim also fails. Again, Mr. Magallanez’s attorney’s assertions that the documents were not related to his client opened the door for the government to explain the purpose of the documents.
Chavez,
B.
Mr. Magallanez next alleges that the prosecutor improperly vouched for the credibility of the government’s witnesses when he referred to their obligation to testify truthfully under their plea agreements. Mr. • Magallanez concedes that there was no objection to the alleged prosecutorial misconduct. Appellant’s Br. at 19. Generally, “[t]his court reviews de novo whether prosecutorial misconduct occurred, which is a mixed question of law and fact.”
United States v. Toles,
“Argument or evidence is impermissible vouching only if the jury could reasonably believe that the prosecutor is indicating a personal belief in the witness’ credibility, either through explicit personal assurances of the witness’ veracity or by implicitly indicating that information not presented to the jury supports the witness’ testimony.”
United States v. Bowie,
C.
Mr. Magallanez next argues that the testimony of a government rebuttal witness was admitted in violation of Federal Rules of Evidence 404(b) and 608. During the government’s case in chief, a government witness testified that Mr. Ma-gallanez had a drug source who “was this ... Mexican from Byron,” Wyoming. R. Vol. 3 at 391. Mr. Magallanez testified on direct examination that he had no “friend or drug connection up in Byron.” R. Vol. 5 at 667-68. To rebut Mr. Magallanez’s testimony, the government called as a witness Carlos Ramirez-Monares, who is from Byron. Mr. Ramirez-Monares testified that he sold a pound of methamphetamine to Mr. Magallanez in 2000. Mr. Magallanez argues that this evidence should have been excluded pursuant to Federal Rule of Evidence 404(b), which precludes evidence of crimes, wrongs, or acts to prove the character of a person in order to show action in conformity therewith. Mr. Magallanez also argues that Rule 608(b), a prohibition on extrinsic evidence offered for attacking or supporting a witness’s character for truthfulness, does not allow this type of evidence.
A challenge to the admission of rebuttal testimony is reviewed for abuse of discretion.
Koch v. Koch Indus., Inc.,
We first analyze Mr. Magallanez’s claim that the testimony violated Rule 608. Rule 608(b) provides, in part, that “[s]pe-cific instances of the conduct of a witness, for the purpose of attacking or supporting the witness’ character for truthfulness ... may not be proved by extrinsic evidence.” Rule 608 does not apply because the evidence was introduced not to “attack” the witness’s “character” but to prove that he had a drug source from Byron. Rule 608(b) does not apply “when extrinsic evidence is used to show that a statement made by a defendant on direct examination is false.A defendant may not make false statements on direct examination and rely on the government’s inability to chai-
*681
lenge his credibility ag. to the truth of those statements.”
United States v. Fleming,
Mr. Magallanez’s Rule 404 argument founders on the same point: Mr. Ramirez-Monares’s testimony was not “character evidence,” but direct rebuttal to Mr. Ma-gallanez’s testimony that he did not have a friend or drug connection from Byron. Mr. Magallanez concedes, as he must, that Rule 404 allows for “character evidence” to be heard for various legitimate purposes, including proof of motive, opportunity, or intent. Rebuttal evidence serves a legitimate purpose consistent with the exceptions listed in Rule 404. It allows a party to “explain, repel, contradict or disprove an adversary’s proof.”
United States v. LiCausi
D.
Finally, Mr. Magallanez argues that there was insufficient evidence to support his conviction. We review the sufficiency of the evidence to support a jury’s verdict de novo.
United States v. Colonna,
Mr. Magallanez contends that we must decide the sufficiency question on the basis of the evidence submitted at the close of the government’s case in chief. To support this argument, he cites
United States v. Finn,
Mr. Magallanez’s attack on the sufficiency of the evidence is based on the lack of physical evidence and the government’s heavy reliance on the testimony of co-conspirators. Neither point is persuasive.
Mr. Magallanez is mistaken to believe that physical evidence is necessary to sustain a verdict. Lack of physical evidence does not render the evidence that is presented insufficient.
See United States v. Gonzalez,
Mr. Magallanez argues that the testimony of these witnesses was not credible. It is not the role of an appellate court to consider the credibility of the witnesses or weigh the conflicting evidence, as these matters are within the exclusive province of the jury.
See United States v. Sanders,
III.
We turn now to Mr. Magallanez’s argument that his sentence was improper under
United States v. Booker,
— U.S. -,
This quantity of methamphetamine gave Mr. Magallanez a base offense level of 32 under the Guidelines. The district court also found that Mr. Magallanez had a criminal history category of I. This was undisputed. Based on his criminal history and the amount of methamphetamine involved, the district court sentenced Mr. Magallanez to 121 months in prison, which was the low end of the applicable sentencing range of 121-151 months. Had the district court based the sentence on the quantity of drugs determined by the jury, Mr. Magallanez could have received a base offense level of 30 at most, and perhaps as low as 26. When we review a verdict where the jury did not find a specific amount of drugs attributable to the defendant, but a range, we only know that the jury found unanimously the amount at the bottom of the range. In this case, the bottom of the range was 50 grams, which would have led to a sentence between 63- *683 78 months, instead of the 121 months at which he was sentenced.
In his brief filed July 21, 2004, Mr. Magallanez argued that the district court’s additional findings with respect to the amount of drugs attributable to him violated
Blakely v. Washington,
Because Mr. Magallanez did not raise his
Blakely/Booker
objection at trial or sentencing, we review for plain error.
United States v. Gonzalez-Huerta,
A.
Mr. Magallanez’s principal constitutional argument is that, under
Blakely
and
Booker,
the district court was required to accept the jury’s special verdict of drug quantity for purposes of sentencing, rather than calculating that amount for itself. At first blush, there might seem to be force to this argument.
See United States v. Pimental,
*684
But Mr. Magallanez’s argument is wrong. Even prior to the Sentencing Reform Act, the Supreme Court held that a sentencing court had broad discretion to consider information concerning the defendant’s life and characteristics, including conduct on which he had not been convicted.
See Williams v. New York,
No limitation shall be placed on the information concerning the background, character, and conduct of a person convicted of an offense which a court of the United States may receive and consider for the purpose of imposing an appropriate sentence.
According to the Court, “[t]he Guidelines did not alter this aspect of the sentencing court’s discretion,”
Watts,
The decision in Wafts was predicated on the rationale that “different standards of proof ... govern at trial and sentencing.”
Nothing in
Booker
changes this analysis.
1
18 U.S.C. § 3661, which underlay the decision in
Watts,
remains in full force.
See Booker,
B.
It was error, however, for the district court to increase Mr. Magallanez’s sentence beyond the maximum authorized by the jury verdict through mandatory application of the Guidelines to judge-found facts.
See Booker,
To warrant reyersal on plain error review, the constitutional error must have affected the “substantial rights” of the defendant.
United States v. Cotton,
We need not resolve whether Mr. Ma-gallanez has met his burden of showing an effect on his substantial rights if he cannot also show that the error seriously affected the fairness, integrity, or public reputation of judicial proceedings.
Cotton,
Under the facts of this case, we cannot conclude that Mr. Magallanez establishes that this error seriously affects the fairness, integrity, or public reputation of judicial proceedings. His sentence is within the national norm and there is no record evidence to support a lower sentence. Moreover, the district court did not merely find the sentencing-enhancement facts by a preponderance of the evidence. The court expressly noted that those facts were proved “beyond any doubt in my mind.”' That strongly suggests that even with greater latitude, post-Booker, to take the weight of the evidence in support of sentencing enhancements into account, the court would reach the same conclusion regarding drug quantity. The court based its assessment of drug quantity on the evidence at trial, totaling up all drug quantities specifically linked by witnesses to Mr. Magallanez. Neither at sentencing nor in this Court has Mr. Magallanez pointed to any error in the court’s calculations.
Nor is there is any reason to think the non-constitutional aspect of the
Booker
error warrants correction on plain error review. The district court did not make any comment that could be construed as expressing dissatisfaction with Mr. Magalla-nez’s sentence, nor were there any facts in the record to suggest a reasonable probability that the district court would have exercised its discretion to depart from the Guidelines.
Cf. United States v. Trujillo-Terrazas,
In light of the district court’s high degree of confidence in its finding of drug quantity, the lack of any basis in the record to doubt the accuracy of the court’s calculations, and the absence of any reason to think the Guidelines range produced an inappropriate sentence under the facts of this case, a remand would be an exercise in futility. We therefore conclude that Mr. Magallanez has not met his burden of showing that the fairness, integrity, or public reputation of the proceedings would be imperilled by the sentence.
Accordingly, we AFFIRM Mr. Magalla-nez’s conviction and sentence.
Notes
. In his opinion on the
Booker
merits, Justice Stevens discussed
Watts
and concluded: "None of our prior cases is inconsistent with today's decision.”
