Opinion for the Court filed by Circuit Judge ROGERS.
Appellant John A. Cuffie appeals from his convictions of possession with intent to distribute cocaine base and conspiracy to possess and distribute cocaine base, as well as from the denial of his motion for a new trial, on the ground that the government failed to disclose favorable evidence under
Brady v. Maryland,
I.
Berry’s expungement proceeding. The undisclosed Brady material in Cuffie’s trial was Moore’s testimony at a hearing in D.C. Superior Court on September 30, 1991, to expunge the arrest record of Moore’s cousin Walter E. (“Gene”) Berry. Moore had been a police officer when Berry was arrested on January 26, 1989, but had lost his police powers in September 1990.
At the expungement hearing, Moore testified that on the day that Berry was arrested, Berry had called Moore while Moore was at work at the police station. Moore testified that Berry told him that his car had been stolen over the weekend and that when he got it back he found drugs in it. According to Moore, he told Berry that his shift would end at 11 p.m. and that Berry should bring the drugs to him then. Moore also testified that he waited until about 12 a.m. and then went home, discovering the next day that Berry had been arrested on his way to the police station. Berry also testified and supported Moore’s version of events, adding that he had reported the car stolen when a friend he had lent it to did not return it. Berry’s friend, Bryan J. Bunyan, testified that he had borrowed Berry’s car and had left the cocaine in the car without Berry’s knowledge.
The government called James Slaughter-beck, a police sergeant who maintained officers’ attendance records. Slaughterbeck testified that Moore went off duty at 8 p.m. on January 26, 1989, and took three hours leave for the period from 8 to 11 p.m. The Superi- or Court judge stated that he was “extremely concerned” by the inconsistency between Moore’s testimony and the police-station records. In addition, the judge noted that Berry was unable to explain the presence of Metropolitan Police Department drug test kits in the car. Because of the problems with Moore’s testimony and the drug test kits, the judge denied Berry’s motion to expunge his arrest record.
“First Stop” investigation. In mid-August 1991, the Metropolitan Police Department began an investigation into suspected drug-dealing at the “First Stop” convenience store at the corner of New York Avenue and Bladensburg Road, in Northeast D.C. The police suspected that Cuffie was part of the drug-dealing ring, along with Moore, Berry, Bunyan, and three others, operating from that location. An undercover informant bought drugs at the “First Stop” store on *516 September 20,1991, when Cuffie was present but did not participate directly in the sale. The informant tried to involve Cuffie in a drug purchase on November 8, 1991, but Cuffie did not show up at the “First Stop” store. That sale attempt ended when one of the drug dealers discovered that the informant was wired with a recording device. In a later telephone call, the informant found out that the drug ring stored the cocaine at Moore’s apartment but kept it locked up because Moore was a drug addict.
Search of Moore’s apartment. On December 9, 1991, at about 1:45 a.m., Moore was arrested with four packets of crack cocaine and charged with possession of cocaine base. The police testified at Cuffie’s trial that Moore’s arrest was unrelated to the First Stop investigation. Fearing that Moore’s confederates might react by removing the cocaine stored in Moore’s apartment, the police obtained a search warrant and entered Moore’s apartment at about 4:55 p.m. on December 9.
When the police arrived, the only person in Moore’s apartment was Cuffie. Sergeant Michael P. Wilson and Detective Anthony Washington testified that Cuffie was standing in front of the locked door to one of the two bedrooms in the apartment. When Cuf-fie complied with police orders to put his hands in the ah’, a set of keys fell out of his right hand. The police determined that one of the keys that Cuffie dropped opened the bedroom door. Inside the locked bedroom, the police found a closet with a safe, and beside the safe was a plastic container with sixty grams of crack cocaine and six grams of powder cocaine.
Coincidentally, while the police were searching the apartment, Berry arrived. The police determined that none of the keys on Berry’s person fit the lock to the bedroom door. Moreover, none of the keys found on Moore when he was arrested earlier that day turned out to fit the lock.
Cuffie’s trial. Cuffie and his six co-defendants (including Moore) were charged in a fourteen-count indictment. All of the defendants except for Cuffie pleaded guilty. At a December 20, 1991, bond hearing for Moore, the prosecutor asked police officer John J. Brennan about the expungement proceeding for Berry, and Brennan explained the inconsistency in Moore’s testimony on behalf of Berry.
At Cuffie’s trial in July 1992, Moore testified that Cuffie had paid him to keep drugs in Moore’s apartment and bring women there; that Cuffie had brought the safe to one of the bedrooms; that Moore had not had a key to the bedroom; and that Moore had never seen anyone but Cuffie go into the bedroom. On cross-examination by Cuffie’s counsel, Moore testified that he used to have a $200 to $300 a day cocaine habit. Moore admitted that he knew that former police officers often have a bad time in jail; that he “would do almost anything not to go to jail”; and that until two days before his testimony he had maintained his innocence. Moore also disclosed the details of his plea agreement with the government. Finally, Cuffie’s counsel juxtaposed Moore’s violation of his oath as a police officer -with the oath that Moore took as a witness.
At the close of the government’s case-in-chief, the district court dismissed twelve counts based on the September 20, 1991, and the November 8, 1991, incidents for lack of evidence to connect Cuffie to the drug sales on those dates. The remaining two counts to go to the jury were for conspiracy to distribute and to possess with intent to distribute more than fifty grams of cocaine base in violation of 21 U.S.C. § 846 (1988), and for possession with intent to distribute more than fifty grams of cocaine base in violation of 21 U.S.C. § 841(a)(1), (b)(l)(A)(iii) (1988) and 18 U.S.C. § 2 (1988) (the December 9, 1991, incident).
In his closing argument, Cuffie’s counsel told the jury that the case “comes down to one point only, and that point is Officer Ronnie Moore.” He asked rhetorically, “if the ease, in fact, turns on this key [found on Cuffie], then ask yourselves why did [the government] have to put Ronnie Moore on the stand?” He answered his own question, “[The government] needed Mr. Moore to put drugs in John Cuffie’s hand, to put John Cuffie in the apartment, and to give John *517 Cuffie a role in an organization which never existed.”
The jury found Cuffie guilty of the two remaining charges, and the district court sentenced Cuffie to 235 months’ imprisonment. At the sentencing hearing for co-defendant Berry, who had pleaded guilty, the prosecutor told the court that, although the police had never found a key to the locked bedroom in Moore’s apartment belonging to Berry, “I think there was some element of access there.” When the court decided to grant Berry a downward departure, the prosecutor revealed Berry’s 1989 arrest and stated that he “believe[d] that the evidence would show ... that Mr. Berry suborned perjury in that case in connection with it being dropped.” According to the prosecutor, Berry, Bunyan and Moore “got together and the reason they did it was to get the charge off Gene [Berry].”
The district court denied Cuffie’s motion for a new trial, stating that
defendant has failed to establish a violation by the government of the rule of Brady v. Maryland,373 U.S. 83 ,83 S.Ct. 1194 ,10 L.Ed.2d 215 (1963) or a reasonable probability that the outcome of his trial would have been different had certain information been disclosed to him, see United States v. Bagley,473 U.S. 667 ,105 S.Ct. 3375 ,87 L.Ed.2d 481 (1985)....
II.
The government commendably concedes on appeal that its failure to disclose Moore’s perjury in the expungement proceeding violated the
Brady
rule. The prosecution has the same duty under
Brady
to disclose impeachment evidence as it does exculpatory evidence.
Kyles v. Whitley,
— U.S. -, -,
Consequently, the only issue on appeal is whether the evidence of Moore’s perjury was material. Our inquiry is confined to a determination of whether “ ‘there is a reasonable probability that, had the evidence been disclosed to the defense, the result of the proceeding would have been different.’ ”
Kyles,
— U.S. at --,
The government contends that Moore was thoroughly impeached at trial, such that the undisclosed evidence would have furnished only cumulative impeachment. Yet “‘the fact that other impeachment evidence was available to defense counsel does not render additional impeachment evidence immaterial.’ ”
Smith,
In
Smith,
a very similar ease, the court concluded that undisclosed impeachment evidence concerning a government witness was material. Although the defense in
Smith
knew that the witness had entered into a plea agreement with the government under which ten of eleven counts against him in federal court were dismissed and the government agreed to file a motion recommending a downward departure in sentencing, the government did not disclose that it also agreed to dismiss two felony charges pending in D.C.Superior Court.
Smith,
Second, the government maintains that the undisclosed impeachment evidence was immaterial because Moore’s testimony was not essential to the prosecution’s case against Cuffie. Besides Moore’s testimony, the government presented circumstantial evidence that Cuffie possessed the drugs found in the bedroom of Moore’s apartment, namely that Cuffie was in the apartment when the search warrant was executed; that he had a key to the locked bedroom containing the drugs on his person; that neither Moore nor Berry had a key to the locked bedroom on his person when he was arrested; and that there was other evidence of drug activity in the apartment. Although the remaining evidence standing alone would have been sufficient to convict, the
Brady
materiality inquiry is not an assessment of the sufficiency of the evidence.
Kyles,
— U.S. at -,
For these reasons we are unconvinced that the jury verdict is “worthy of confidence” in light of the undisclosed impeachment evi-
*519
denee. A cross-examination of Moore that revealed evidence casting serious doubt upon Moore’s truthfulness as a witness in a judicial proceeding could have changed the nature of Cuffie’s trial.
Cf. Smith,
Notes
. We need not address Cuffie’s contention that Moore's perjury at the expungement hearing would have been admissible to prove Moore's bias toward exculpating Berry.
. As the court explained in
Smith,
.
See, e.g., United States v. Maloney,
