On July 11, 1996, dеfendant David Earnest was convicted by a jury of conspiracy to distribute and possess with intent to distribute cocaine base in violation of 21 U.S.C. §§ 841(a)(1) and 846 and possession with intent to distribute cocaine base in violation of 21 U.S.C. § 841(a)(1). On January 23, 1997, defendant was sentenced by the Honorable J. Phil Gilbert to 420 months imprisonment. Defendant appeals, claiming (1) that the district court erred when it held that the prosecution did not violate its disclosure obligations under
Brady v. Maryland,
Background
On May 1, 1996, agents from the Murphys-boro, Illinois Police Department and the Federal Bureau of Investigation received a tip from Jennifer Unterfer that defendant Earnest and co-defendant Vida Humphries would be going to Chicago, Illinois, on May 1, 1996, to obtain crack cocaine to distribute in the Murphysboro area. Unterfer had been purchasing crack cocaine from the defendant and, in fact, testified that she had received crack cocaine from him on the previous evening. To confirm this information, police had Unterfer record a conversation with the defendant by means of a concealed tape recorder. During the conversation, Unterfer paid defendant $150 in satisfaction of a prior drug debt and defendant told Unterfer that he planned to travel to Chicago with Humphries on May 1, 1996, for the purpose of obtaining one ounce of crack cocaine.
On May 1, agents observed defendant and Humphries leave Murphysboro and proceed toward Chicago in Humphries’ car and set up surveillance for their return.
On May 3, officers spotted the car returning and followed it into Carbondale. The car, driven by defendant and occupied by passengers Humphries, codefendant Earl Cunningham, Jr. and Michael Hooker, was stopped and searched pursuant to a valid search warrant. The agents discovered a substance concealed in the outside mirror on the driver’s side of the car. Forensic scientist Ileana SuarezHale testified at trial that the substance was 45.4 grams of cocaine base.
Defendant was arrested and interviewed by law enforcement officers. Agents Robert Dueker and Brenn Tallent and Murphysboro Police Department Sergeant Philip Royster testified that defendant admitted that he had been involved with Humphries in the distribution of crack cocaine in Murphysboro. They further testified that defendant told them that he and Humphries, in addition to the recent trip, had made two other trips to Chicago for the purpose'of obtaining crack cocaine for distribution in the Murphysboro area; and that according to defendant, he and Humphries could not obtain any crack cocaine on the first trip but obtained at least one and one-fourth ounce of crack cocaine on the second trip. 1 According to the agents, the defendant stated that he sold $20 and $50 “rocks” to customers in Murphysboro and confirmed that he had sold crack cocaine to Unterfer and had made arrangements to furnish her with more crack upon his return *909 from his May 1 trip. Additionally, defendant told agents that because he could no longer purchase drugs from a particular- drug source, Humphries would have to purchase the drugs in Chicago.
These admissions were corroborated by Humphries who admitted to agents and at trial that he and defendant had been obtaining crack cocaine in Chicago for distribution in Murphysboro. He stated that he and defendant had made three trips to Chicago and gave approximate dates for these trips. On the first trip, they brought back one ounce of crack cocaine, on the second trip, they brought about one-half ounce of crack cocaine, and on this past trip, they brought the cocaine which was discovered in the car’s exterior mirror. Humphries stated that defendant was present when Humphries concealed the cocaine in the mirror. Furthermore, co-defendant Cunningham admitted that he was being brought to Murphysboro to aid defendant and Humphries in distributing crack cocaine.
At trial defendant admitted that he made three trips to Chicago with Humphries but denied that he admitted to agents involvement in distributing crack cocaine, denied that it was his voice on the recorded conversation with Unterfer, and denied that he knew there was crack cocainе in the car when it was stopped. In the face of defendant’s denials, however, the court found the other witnesses credible and disbelieved the defendant.
At trial defendant also requested that the government produce a traffic ticket that remained in Humphries’ car after the car was inventoried and impounded, claiming the government had an obligation to turn it over under
Brady v. Maryland,
After a three-day trial, a jury convicted defendant of conspiracy to distribute and possess with intent to distribute cocaine base, and of possession with intent to distribute cocaine base.
The presentence investigation report concluded that defendant’s relevant conduct involved approximately 80 grams of cocaine based on the amount seized from the vehicle (45.4 grams) and the one and one-fourth ounces that defendant admitted obtaining on a prior Chicago trip (35.4 grams). Overruling defendant’s objection, the district court determined that defendant’s relevant conduct was at least 50 grams of crack cocaine and more accurately up to 75 grams. The court based its сalculation on the testimony of the agents regarding the admissions made by the defendant and the testimony of Humphries that the prior trips were made, noting that such an estimate was conservative. Defendant obtained a writ to secure the presence of Humphries at sentencing to question him about the trips to Chicago, but, due to bad weather, the United States Marshal’s Service was unable to produce him. After reviewing a list of questions that defendant intended to ask Humphries and finding them cumulative of Humphries’ trial testimony, the district court refused to delay sentencing. The court emphasized that it was not going to retry the case at sentencing, having already determined Humphries to be a credible witness.
The district court sentenced defendant to 420 months imprisonment. Defendant аppeals, claiming that (1) the prosecution violated its disclosure obligation under
Brady v. Maryland
by not turning over the traffic ticket, (2) the evidence was insufficient to support the jury’s verdict, (3) he was denied due process at sentencing, and (4) the government failed to prove the cocaine base involved was “crack.” Regarding defendant’s first three contentions, we affirm the district court’s ruling. We remand on the issue of whether the cocaine base involved was crack based on this Court’s recent decision in
United States v. Adams,
*910 I. The Government’s Alleged Violation of Brady v. Maryland
In
Brady v. Maryland,
Defendant argues that he is entitled to a new trial under
Brady
because the government failed to turn over a traffic ticket located in Humphries’ car which defendant claims is relevant for impeachment purposes. Defendant’s claim is without merit. To mount a successful
Brady
challenge, defendant first must show that the prosecution “suppressed” evidence. The obligation to disclose exculpatory or impeaching information under
Brady
is limited to information which is then known to the government. Sеe
United States v. Morris,
Defendant argues that the prosecution suppressed impeachment evidence by not turning over the traffic ticket. We disagree. The government did not have possession of the traffic ticket since it was in Humphries’ car, which had been impounded. In addition, the government did not knowingly suppress the traffic ticket. The government was unaware of the existence and potential significance оf the information on the ticket and, therefore, had no affirmative duty to seek such information not in its possession. See
United States v. Lockhart,
Even if the government could have possessed the ticket by re-entering the car, there is no Brady violation because defendant did not establish that the ticket was favorable to his defense. Defendant objects to the fact that the judge did not delay the trial once defendant learned that the prosecution did not have the authority to retrieve the ticket from the car and accuses the trial judge of being “more concerned that the trial not be continued another day” (Appellant’s *911 Br. at 14). The district court emphasized, however, that even if the ticket was obtained, the defendant did not sufficiently demonstrate that it would be exculpatory. Defendant’s theory was that the traffic ticket was exculpatory because it might have been received by Humphries at a time when Hum-phries was in Chicago and defendant was not. Defendant provided no evidentiary support for this argument. He did not provide the dates that Humphries and defendant were in Chicago or the date that the traffic ticket was received. Humphries also was unable to provide specific dates that he and defendant were in Chicago. Without specific dates, the traffic ticket would be useless as an impeachment tool.
Furthermore, the information contained on the ticket, which presumably would provide a date that Humphries was in Chicago, was not known to the court because the defendant failed to offer the ticket into evidence even though he possessed it at the time of sentencing. See
United States v. Navarro,
Finally, to be entitled to relief under
Brady,
defendant must prove that the ticket is material to his defense. Evidence is material only if there exists a “reasonable probability” that its disclosure to the defense would have changed the result at trial.
Lieberman v. Washington,
While it is true that suppression of evidence relevant for impeachment purposes can still give rise to a
Brady
violation, see
Giglio,
*912 Because it did not suppress material, exculpatory evidence, the prosecution did not violate its obligation under Brady v. Maryland.
II. Sufficiency of Evidence Claim
Defendant argues that the evidence was insufficient to establish guilt on the charges of conspiracy to distribute and possess with intent to distribute cocaine base and possession with intent to distribute cocaine base. Sufficiency of the evidence challenges will be rejected if any rational jury could have found the defendant guilty beyond a reasonable doubt.
United States v. Hall,
The evidence at trial established that Jennifer Unterfer had been purchasing crack cocaine from the defendant. Unterfer provided agents from the police department and FBI with information that defendant and co-defendant Humphries would be going to Chicago, Illinois, on May 1, 1996, to obtain crack cocaine for distribution. To confirm this tip, police had Unterfer record a conversation with defendant during which Unterfer paid the defendant for a рrior drug debt and defendant informed Unterfer that he planned to travel to Chicago to obtain one ounce of crack cocaine. Police then observed defendant leave for Chicago.
When defendant returned, along with Humphries, co-defendant Cunningham, and Hooker, police officers stopped and searched the vehicle pursuant to a valid warrant, uncovering 45.4 grams of cocaine base in the driver’s side exterior mirror.
During a post-arrest interview, defendant admitted to three different agents that he and Humphries were involved in the distribution of crack cocaine. Defendant also admitted that, in addition to the recent trip, he and Humphries had made two previous trips to Chicago to obtain crack cocaine to distribute. Finаlly, defendant admitted that he sold crack to Jennifer Unterfer.
Humphries corroborated these admissions. He admitted to agents and at trial that he and defendant were involved in the distribution of crack cocaine. He admitted that he and defendant had made three trips to Chicago to obtain crack. Humphries also stated that he showed the defendant the crack in the car mirror and asked his opinion regarding the hiding place.
Co-defendant Cunningham, who was in the vehicle when it was stopped, testified that he was being brought to Murphysboro to aid defendant and Humphries in distributing crack cocaine.
While defendant denied that he admitted to agents involvement in distributing crack cocaine, that it was his voice on the recorded conversation with Unterfer, and that hе knew there was crack cocaine in the car when it was stopped, the court concluded that the witnesses were credible and that defendant was not telling the truth. Specifically, the court stated:
[T]he jury [had] to have found Mr. Hum-phries to be a credible witness. I find him to be a credible witness. I find Miss Unterfer to be a credible witness, not only at trial, but my observations today before this Court. And then when you factor that in with the testimony of Agent Tallent and Officer Royster, and what they say was a confession made by the defendant which the defendant now recants, the overwhelming evidence is that the defendant is not being accurate with his recitation of the facts of this case.
Sentencing Tr. at 70-71.
In contending that the evidence is insufficient to support his convictions, defendant is attempting to reargue and reweigh the evidence on appeal. Specifically, in his brief, defendant tries to cast doubt on Humphries’
*913
testimony by pointing out that only on the day before trial did Humphries tell the agent that defendant knew the drugs were in the ear mirror. Defendant also tries to cast doubt on the testimony of the agents who interviewed defendant by arguing that then-responses were “conclusory” and, therefore, that “no statement by defendant as testified to by the ofBcers should be used to place defendant in the conspiracy.” Appellant’s Br. at 18. However, the district court found these witnesses to be credible, and this Court has repeatedly stated that “[t]he credibility of witnesses is peculiarly within the province of the jury and our review of credibility is prohibited absent extraordinary circumstаnces.”
Moore,
Viewing the evidence in the light most favorable to the government and deferring to the district court’s assessment of the credibility of the witnesses, a rational jury could have found defendant Earnest guilty beyond a reasonable doubt. Therefore, this Court finds the evidence sufficient to support the defendant’s convictions for conspiracy to distribute and possession of cocaine base.
III. Due Process Claim
Defendant next claims that he was dеnied due process at sentencing when the trial judge denied him an opportunity to present testimony on relevant conduct. Specifically, defendant argues that his due process rights were violated when the district court refused to delay the sentencing so that Humphries, unable to be there due to inclement weather, could be present. Had he been able to examine Humphries concerning the traffic ticket, defendant Earnest contends, he could have undermined Humphries’ credibility as to whether defendant Earnest customarily accompanied him on cocaine-buying trips to Chicago. After perusing the questions that defendant Earnest planned to ask Humphries, the district judge concluded that the examination would add nothing significant tó Humphries’ trial testimony. The сourt therefore refused to delay sentencing until Humphries could arrive and testify.
Due process requires both that a defendant receive the procedural protections appropriate to the sentencing determination and that he be sentenced on the basis of reasonably reliable information.
United States v. Campbell,
As to the second possible due process violation-based on a claim that the evidence on which his sentence was based was unreliable — defendant Earnest fares no better. To mount this sort of due process claim successfully, defendant must show that the information before the court was inaccurate and that the court relied on it.
Campbell,
*914
Defendant argues that the evidence presented regarding the quantity of drugs came from untrustworthy witnesses. To prove the unreliability of Humphries’ trial testimony concerning the pair’s drug-buying trips to Chicago, defendant submitted two letters written by Humphries. Defendant also intended to rebut Humphries’ trial testimony with the traffic ticket which defendant, as stated earlier, did not prove was useful as an impeachment tool and which defendant never even introduced into evidence at sentencing. Finally, defendant submitted a list of questions that he planned to ask Humphries during sentencing. The district court found that Humphries’ presence was unnecessary because the subject matter of the questions had been covered at trial where Humphries had been found to be a credible witness.
The district court was correct in relying on Humphries’ testimony at trial for relevant conduct issues at sentencing. Credibility questions like these are for the trier of fact to resolve in all but the most extraordinary circumstances. See
United States v. Taylor,
Having found Humphries to be a credible witness, the district court based the relevant drug quantity calculation on the 45.4 grams found in the car, the defendant’s own post-arrest statements which admitted to purchasing one and one-fourth ounces on a previous trip (35.4 grams), and Humphries’ statements regarding the previous trips. The district court’s calculation of the quantity of drugs involved in an offense is a finding of fact to be reversed only for clear error.
Hall,
In basing defendant’s relevant conduct determination on the search of the vehicle and the admissions of both defendant and Hum-phries, the court used reasonably reliable information. Moreover, the court did not err in concluding that further testimony by Humphries at the sentencing stage was unnecessary. The court’s sentence therefore did not violate defendant’s right to due process.
IV. Defendant’s Contention that Government Did Not Prove Substance in Question was “Crack”
In his appeal, defendant claims that he was convicted of conspiracy to distribute and possession with intent to distribute “cocaine base” but that the district court sentenced him as if he distributed “crack.” Defendant argues that there is a distinction between cocaine base and crack and that the government failed to prove by a preponderance of the evidence that the substance in question was crack. In light of this Court’s recent decision in
United States v. Adams,
This Court has long recognized the distinction between powder cocaine and crack cocaine. The sentencing enhancement for crack in relation to that for powder cocaine, in terms of the drug weights corresponding to spеcific guideline levels, is 100:1. Id. at 590. Thus possession of one ounce of crack results in the same sentence as possession of 100 ounces of powder cocaine. Id. While the sentencing scheme is well-established with respect to the distinction between “crack” and “cocaine powder,” it has not always been clear with respect to the distinction between “cocaine base” and “crack.” Until 1993, the Sentencing Guidelines did not define “cocaine base.” Id. As a result, courts applied the interpretation that all cocaine base was to be treated as “crack,” thus subject to a more severe sentence, and that only powder cocaine could be addressed under the more lenient sentencing schedule. Id. at 590-91.
In response to the interpretation by the courts that all forms of cocaine base should be treated as crack
2
and punished more severely, the Sentencing Commission amended the sentencing guidelines.
3
To clarify that a § 2D1.1 enhancement should apply only to the crack form of cocaine base, the 1993 amendment added a definition of “cocaine base.” See U.S.S.G. § 2D1.1(c) note (D); see also
Adams,
“Cocaine base,” for the purposes of this guideline, means “crack.” “Crack” is the street name for a form of cocaine base, usually prepared by processing cocaine hydrochloride and sodium bicarbonate, and usually appearing in a lumpy, roeklike form.
U.S.S.G. § 2D1.1(c) note (D).
This Court recently had the opportunity to interpret the 1993 amendment to the Sentencing Guidelines in
United States v. Adams.
Recognizing a distinction between crack and cocaine base, this Court held that under the new definition of “cocaine base” found in the guidelines only the form of “cocaine base” which is “crack” is eligible for the enhanced sentence.
Adams,
In reaching its result, this Court relied on
United States v. James
where the Third Circuit found a sentencing enhancement inappropriate when the government failed to prove by a preponderance of the evidence that the form of cocaine base defendant James sold was crack.
James,
[g]iven the highly severe sentencing ratio of 100:1 for crack versus cocaine, James’ sentence may vary dramatically depending on whether he sold crack or cocaine. We do not believe that, without more, the casual reference to crack by the Government in the colloquy with the court over [ ] the relevant quantity of cocaine base in determining James’ offense level [ ] unmistakably amounted to a knowing and vоluntary admission that the cocaine base constituted crack.
Adams,
Having found no waiver by defendant, the James court next addressed the issue of the Guidelines’ treatment of crack versus cocaine.
James,
While the question of waiver is fact specific, the district court here never entered into an analysis of whether defendant Earnest waived his right to contest the enhanced sеntence by admitting that the substance was crack. Both the district court and the government relied on
United States v. Booker,
*917
Because defendant Earnest’s sentencing hearing occurred prior to the date
Adams
was decided,
5
we remand this case to the district court to determine whether defendant waived his right to contest the enhanced sentence by admitting that the substance was crack and, if not, whether the government can prove by a preponderance of the evidence that the substance in question was crack. Unlike the situation in
James
where the indictment, the defendant, and the court at the plea colloquy spoke in terms of cocaine base, the indictment here charged defendant Earnest with the distribution and possession of “crack cocaine,” defendant, counsel, and the court referred to the substance as crack cocaine at trial, witnesses testified that defendant was involved in distributing “crack cocaine,” co-defendant Humphries admitted that he had been invоlved in crack cocaine distribution with the defendant, agents testified that defendant admitted involvement in crack cocaine distribution, and the court found that defendant had not testified reliably. See
United States v. Hall,
The case is remanded solely with respect to the issue discussed in Part IV of this opinion. Otherwise, the judgment of the district court is affirmed.
Notes
. One ounce is equivalent to 28.35 grams.
. This Court has recognized that crack is only one of several forms of cocaine base.
United States v. Abdul,
. The Cоmmission expressly stated that the purpose of the amendment was to address a conflict among the circuits as to the meaning of “cocaine base” and explained that "forms of cocaine base other than crack
(e.g.,
coca paste * * *) will be treated as cocaine.” U.S. Sentencing Guidelines Manual App. C, amend. 487 (1995); see
Abdul,
. [Government attorney]: * * * [Defendant] was found with nine ounces of crack cocaine on his possession on May 25th, 1995. That converts to almost over 25 kilograms of powder cocaine under the conversion. * * * * If you want to look at just this offense, the nine ounces of crack convert to over 900 ounces of powder cocaine because of the 100-to-1 ratio, here.
[Defendant]: But that wasn’t crack, it was base you know.
[Government attorney]: Crack is base.
[Defendant]: Oh yeah?
Adams,
. This court decided United States v. Adams on September 24, 1997. Defendant Earnest's sentencing hearing took place on January 23, 1997.
