I.
OVERVIEW
A jury сonvicted appellant Jose Arambu-la-Ruiz (Arambula) for conspiracy to possess a controlled substance with intent to distribute, possession of a controlled substance with intent to distribute, and aiding and abetting in violation of 21 U.S.C. § 841(a)(1) (1984), 21 U.S.C. § 846 (1984) and 18 U.S.C. § 2 (1979). He was sentenced to a ninety-month jail term followed by four years of supervised release. He appeals claiming that both evidentiary and constitutional errors occurred at trial. The district court had jurisdiction pursuant to 18 U.S.C. § 3231. We have jurisdiction over this timely appeal under 28 U.S.C. § 1291 and now affirm.
II.
BACKGROUND
Drug Enforcement Agent Jorge Rodriguez went undercover to investigate Otto Rene Aldana. Aldana negotiated a sale of fifteen ounces of heroin with Rodriguez and, after meeting to test a sample, they arranged for delivery of the drug on June 27, 1990, at a Denny’s Restaurant.
On June 27, while Agent John Roberts was conducting surveillance at Aldana’s apartment, he observed Arambula and Mar-iles-Ortega standing outside conducting “counter-surveillance.” He then saw Alda-na, Arambula, Mariles, Medina-Flores and *602 Guerra-Remboa congregate on the front porch, after which both Arambula and Mar-iles went to a Chevrolet Impala and retrieved a white package from the trunk. Afterwards, they all returned to the house and came out approximately five minutes later with Aldana carrying a brown paper sack.
They got into three separate cars and drove to Denny’s where Agent Rodriguez was waiting. Arambula and Mariles drove to the restaurant in the Chevrolet Impala and upon their arrival went inside Denny’s. Medina and Guerra walked to the side of the restaurant, and Aldana remained in his car. Agent Rodriguez approached Alda-na’s vehicle. Aldana then handed the brown paper sack to Rodriguez which contained heroin. All five men were immediately arrested.
A federal grand jury returned a two-count indictment against all five men (Ar-ambula, Aldana, Medina, Mariles and Guerra), charging them with conspiracy to possess a controlled substance with intent to distribute, possession of a controlled substance with intent tо distribute, and aiding and abetting. Arambula pled not guilty and was tried jointly with Medina and Guerra; Aldana’s trial was severed; and Mar-iles pled guilty.
The jury found Arambula guilty on both the conspiracy and possession counts; however, the jury found codefendants Medina and Guerra not guilty on the possession charges. Because the jury was unable to agree on the conspiracy charges against Medina and Guerra, the court granted their motions for acquittal.
Arambula now appeals claiming that the district court erred in three ways: (1) admitting evidence of prior bad conduct for the limited purpose of showing knowledge and intent; (2) admitting co-conspirator statements in violation of Fed.R.Evid. 801(d)(2)(E); and (3) failing to grant his motion for mistrial after an alleged
Bruton
error.
See Bruton v. United States,
III.
DISCUSSION
A. Prior Bad Conduct
Arambula contends the district court erred in admitting evidence of his prior drug conviction for possession of a controlled substance with intent to distribute.
We review for abuse of discretion the district court's decision to admit evidence of prior bad conduct under Fed. R.Evid. 404(b).
United States v. Rubio-Villareal,
Fed.R.Evid. 404(b) provides that evidence of prior crimes, acts or wrongs is not admissible to prove the character of an accused in order to show action in conformity with that character. However, Rule 404(b) also sets forth an exception which allows the admission of prior conduct for the purposes of proving motive, opportunity, intent, preparation, plan, knowledge, identity, or absence of mistake or accident.
In determining whether evidence of Arambula’s prior conviction was properly admitted under Rule 404(b), the evidence must satisfy the following four requirements: (1) it must prove a material element of the offense for which the defendant is now charged; (2) in certain cases, the prior conduct must be similar to the charged conduct; (3) proof of the prior conduct must be based upon sufficient evidence; and (4) the prior conduct must not be too remote in time.
United States v. Houser,
(1) Material Element
In the present ease, Arambula’s pri- or conviction for possession of heroin with intent to distribute is relevant to a material element of the charged offense because it tends to show knowledge. Knowledge is a material element of the crime of possessing heroin with intent to distribute. 21 U.S.C. § 841. It is also a material element of the crime of conspiring to possess heroin with intent to distribute.
United States v. Schmidt,
Arambula’s defense at trial was that he was an innocent bystander “at the wrong place at the wrong time.” Because he argued that he was unaware of the purpose of the conspiracy to distribute heroin, his prior conviction was relevant to establish a crucial element of the crime charged. It was not admitted, therefore, merely to show criminal disposition.
See United States v. Lewis,
(2) Similarity
Arambula argues that the only similarity between the prior drug conviction and the one under which he was charged is that they both involved narcotics. However, as indicated in our prior opinions, similarity is not always a prerequisite to admissibility under Rule 404(b).
See United States v. Ramirez-Jiminez,
The degree of similarity required ... will depend on the evidential hypothesis which is being employed. Thus, for example, we have held that similarity is always required to prove identity of in-tent_ When offered to prove knowledge, however, the prior act need not be similar to the charged act as long as the prior act was one which would tend to make the existence of the defendant’s knowledge more probable than it would be without the evidence.
Id.
(internal quotation and citations omitted);
see also United States v. Miller,
In this case, the district court admitted the evidence of Arambula’s prior drug conviction for the purpose of showing both intent and knowledge. Although a factual similarity between Arambula’s prior drug conviction and the оne charged is required in the former, evidence of prior bad acts is admissible to show the latter even when similarity is lacking, as long as it makes “the existence of [Arambula's] knowledge more probable than it would be without the evidence.”
Ramirez-Jiminez,
(3) Sufficient Proof
In this case, the fact that Arambula was convicted of the prior drug offense is sufficient proof that the defendant committed the prior act.
(4) Remoteness
Arambula’s prior arrest for possession of controlled substances with intent to sell occurred on March 23, 1989. He was convicted on May 2, 1989. The district court did not err in ruling that evidence of the prior cоnviction was not too remote in
*604
time. We have held that a conviction which occurred five years prior to the charge at issue was not too remote.
Houser,
(5) Probative Value/Prejudicial Effect
Finally, we must review for abuse of discretion the district court’s decision that the probative value of the evidence concerning Arambula’s prior conviction outweighed its prejudicial value. Id. Both Fed.R.Evid. 403 and Rule 404(b) require the district court to engage in balancing probative value with prejudicial effect: “The determination must be made whеther the danger of undue prejudice outweighs the probative value of the evidence in view of the availability of other means of proof and other factors appropriate for making decisions of this kind under Rule 403.” Fed. R.Evid. 404(b) advisory committee’s note.
In
Houser,
we noted the prior drug conviction was probative to show intent; but, we also recognized that “[i]t is always possible that the similarity between the prior acts and the current offense would, improperly affect the jury’s deliberations.”
Houser,
The district court in this case engaged in the requisite balancing and determined the probative value of the prior conviction evidence outweighed its prejudicial effect. After reviewing the record, we do not find the district court abused its discretion in ruling that the probative vаlue outweighed any prejudice to Arambula. Furthermore, the judge gave an appropriate instruction limiting the purpose for which the jury could consider evidence of the defendant’s prior conviction.
See Rubio-Villareal,
In addition to the prior drug conviction, Arambula argues that the district court erred in admitting evidence of two prior arrests under Rule 404(b), one for being an undocumented alien and one for illegal possession of a firearm. However, the Government claims Arambula has waived any objection on appeal because he did not object at trial to the admission of his prior arrests. We reject the Government’s contention.
Although Arambula’s оbjection lacked specificity, it was sufficient to preserve the issues on appeal. Arambula objected during the motion in limine to evidence of the prior drug arrest, including all charges that were the product of that arrest. At trial, Arambula made a timely objection after the Government questioned the arresting officer as to what charges were brought against Arambula as a result of the prior drug offense. After the objection was overruled, the officer stated that he had also arrested Arambula for being an undocumented alien and for illegal possession of a firearm.
Arambula’s objection encompassed all “charges” that the arresting officer would subsequently include in his answer to the Government’s question. The district court judge stated that he had read the record of the prior charges and ruled that the probative value of the evidence outweighed any prejudice. The record included reference to the prior firearm and undocumented alien charges. Thus, the judge was ruling on those charges as well. Because Aram-bula objected to the question regarding all prior “charges,” he did not waive his right to appeal the admission of those two prior arrests.
We next consider whether admitting evidence of the prior arrests constituted error. Those prior arrests did not establish a material element of the crimes charged. Thus, they lacked probative value because they were not relevant to the charges at issue in Arambula’s trial, i.e., *605 conspiracy аnd possession of heroin with intent to distribute. Illegal possession of a firearm and undocumented alien charges do not tend to prove a material issue of the drug conspiracy and possession charges. Therefore, evidence of the prior arrests should have been excluded under Rule 404(b) because it was not admissible for purposes other than to show Arambula’s character or propensity to commit bad acts.
However, notwithstanding the district court’s error in allowing into evidence rеference to those charges, we must determine whether the error requires reversal or is harmless. This court reverses for nonconstitutional errors in admitting evidence “ ‘only if it is more probable than not that the erroneous admission of the evidence materially affected the jurors' verdict.’ ”
United States v. Bettencourt,
We conclude the error was harmless because it is not probable that the evidence materially affected the jurors’ verdict. First, the judge instructed the jury of the limited purpose for which they were to use that type оf evidence. Second, the testimony elicited from the officer as to the firearm and undocumented alien arrests arose within the context of his testimony regarding Arambula’s prior drug arrest which was the main purpose of his testimony. Finally, those two arrests were mentioned only in the officer’s testimony; the Government made no reference to them in closing arguments. Therefore, given the limited reference to those prior arrests, we find the admission of this evidence was harmless error.
B. Bruton Error
Arambula next argues that the district court committed a Bruton error when it denied his mоtion for mistrial after counsel for a codefendant asked a leading question referring to an inadmissible co-conspirator hearsay statement which incriminated Arambula. He contends that the alleged error violated his Sixth Amendment right to confrontation. We disagree.
Denials of motions for mistrial are reviewed for abuse of discretion.
United States v. Homick,
The Supreme Court held that wherе one defendant’s confession inculpates another defendant, the former’s confession cannot be admitted into evidence because there is a “substantial risk that the jury, despite instructions to the contrary, [will look] to the incriminating extrajudicial statements in determining petitioner’s guilt....”
Bruton,
Codefendant Guerra’s counsel asked the arresting officer the following question: “You state, in your report, that Aldana told you that the sample was a representative of 40 ounces of heroin that Jose Arambula-Ruiz had in his possession.” Both parties agree that the statement was inadmissible. 1 However, they dispute its prejudicial effect.
We have found no cases which address the precise issue presented here: whether an incriminating
question
posed by defense counsel and based upon a code-
*606
fendant’s confession creates reversible
Bruton
error. An improper incriminating question or series of questions may constitute reversible error in certain cases.
See Douglas v. Alabama,
The question posed in the present case by counsel for Arаmbula’s co-conspirator was different from those posed in
Douglas
and does not require reversal. Indeed, the facts of this case more closely resemble those in
United States v. Carlson,
On appeal, the four defendants argued that the hypothetical question violated
Bruton
and their Sixth Amendment right to confront witnesses against them. We disagreed, however, and concluded that there were several reasons why
Bruton
did not require reversal. One of those reasons is pertinent to this appeal. We observed that the facts of
Carlson
were more similar to
Frazier v. Cupp,
The same reasoning applies, with even more force, to the facts of this case. The question posed by counsel for Arambula’s codefendant was never part of the prosecution’s case, and, significantly, the question was never evidence. The trial court struck the questiоn from the record before the witness had an opportunity to respond to it. In Carlson, by contrast, the witness answered the hypothetical question and his testimony was later stricken from the record. See id.
The Court in
Bruton
explicitly sought a solution to the difficulty juries have in disregarding certain improperly admitted evidence that seriously inculpates a defendant.
See Bruton,
The question, moreover, was followed immediately by a limiting instruction which advised the jury to disregard the question and not speculate as to what the answer might have been. Although
Bruton
made clear that in certain circumstances a limit
*607
ing instruction cannot cure the harm caused by the admission of improper evidence, we believe that under the circumstances of this ease, the limiting instruction was sufficient to safeguard any possible infringement of Arambula’s constitutional rights.
See Frazier,
C. Co-conspirator Statements
Arambula next contends the district court’s admission of hearsay co-conspirator statements violated his Sixth Amendment right to confrontation. The undercover officer testified that Aldana had told him Aldana would get the drugs from a source, the owners of the drugs would follow him to the delivery site, and would be present when the sale took place. He argues that the admission of that testimony constituted prejudicial error.
We review for abuse of discretion the district court’s decision to admit co-conspirator statements and for clear error the underlying factual determination that a conspiracy existed and that the statements were made in furtherance of that conspiracy.
United States v. Peralta,
Initially, the Government argues that Arambula waived his right to challenge the co-conspirator hearsay statements because he did not make a timely objection and he did not object on Confrontation Clause grounds. We reject both arguments. The Government relies upon
United States v. Moody,
In this case, Arambula objected at trial to the statements on hearsay grounds and moved to strike the testimony. In making the objection, he argued that there was no evidence the statements were made in furtherance of a conspiracy. The district court overruled the objection and allowed the testimony conditioned upon the prosecution’s establishing a conspiracy. Id. Because the requirements for admission of statements under Rule 801(d)(2)(E) satisfy the Confrontation Clause, see infra, there is no confrontаtion violation if the federal rule is satisfied. Thus, Arambula’s hearsay objection preserved the issue for appeal.
The Supreme Court has ruled that the requirements for admitting co-conspirator hearsay statements pursuant to Fed. R.Evid. 801(d)(2)(E) and the requirements under the Confrontation Clause are identical.
Bourjaily v. United States,
In
Yarbrough,
we stated that mere conversations or narrative declarations are not made in furtherance of a conspiracy; rather, statements are in furtherance of a conspiracy if they “further the common objectives of the conspiracy or set in motion
*608
transactions that are an integral part of the conspiracy.”
Id.
at 1535. Statements which induce pаrticipation or prompt further action in the conspiracy are admissible.
Id.
Moreover, we have established the following standard for admissibility: “[statements made by co-conspirators are admissible if there is sufficient evidence to support the inference that the statements were made in furtherance of the conspiracy while the conspiracy was in existence.... The trial court’s finding that a statement was made in furtherance of a conspiracy is entitled to deference.”
United States v. Miller,
In the present case, the undercover officer testified that Aldana told him he would get the drugs from a source. The officer also stated that Aldana told him the owners of the drugs would follow him to the delivery site and would be present when the sale was made. These statements were properly admitted. There was sufficient evidence to support both an inference that a conspiracy existed and that the statements were made in furtherance of that conspiracy. Agent Roberts testified that all five defendants had been at Aldana’s residence and that Arambula and Mariles had pulled a white package from the car. In addition, Rodriguez testified that all five men were at the delivery site (Denny’s). Moreover, -the co-conspirator statements were made “in furtherance of a conspiracy” because they fulfilled the objectives of the conspiracy. We find the district court did not clearly err either in its factual determination that a conspiracy existed or in its conclusion that thе statements were made in furtherance of that conspiracy. Therefore, because the statements were properly admitted under Rule 801(d)(2)(E), Arambula’s confrontation rights were not violated.
See Bourjaily,
Finally, Arambula argues that the cumulative effect of the errors was so prejudicial as to warrant reversal. However, because we conclude that the only error which occurred was harmless, we need not address this final contention.
CONCLUSION
The district court properly admitted both the prior drug conviсtion under Rule 404(b) and the co-conspirator statement pursuant to Rule 801(d)(2)(E). Although the district court erred in admitting the prior firearm and undocumented alien arrests, it was harmless error. Finally, we conclude no Bruton error occurred.
AFFIRMED.
Notes
. Guerra's counsel inadvertently asked the question. He misconstrued the point in time at which the alleged statement was made. The report reads as though Aldana’s statement had been made in the course of the conspiracy, and therefore was arguably admissible under the co-conspirator hearsay exception, Rule 801(d)(2)(E). In fact, Aldana made that statement after his arrest and as part of his confession; thus, it was inadmissible.
