Appellee William Weitz Shaffer was convicted on several counts of narcotics and income tax violations. The district court granted Shaffer’s motion for a new trial, concluding that the government’s failure to disclose to Shaffer certain impeachment evidence regarding a government witness violated the rule set forth in
Brady v. Maryland,
BACKGROUND
On September 16, 1981, a grand jury returned a superseding indictment charging Shaffer and three other defendants with four counts of narcotics violations and four counts of income tax violations. 1 The indictment alleged that, from February 1975 to April 1977, the four defendants conspired to import and distribute cocaine.
The government’s case against Shaffer rested in large part on the testimony of Robert Durand, an unindicted co-conspirator in the cocaine operation. In May 1980, Durand, in exchange for immunity from prosecution, agreed to cooperate with the government in an investigation into the cocaine operation conducted by Shaffer and the other three defendants. During the investigation of Shaffer, Durand was paid *685 for his expenses in meeting with IRS and DEA agents. In February 1982, Durand was also paid for expenses incurred in traveling to Los Angeles to prepare for Shaffer’s trial. During the trial, Durand was also paid for security expenses, and after the trial, he was paid for security and relocation expenses.
During the cocaine investigation, one of Shaffer’s indicted co-conspirators, James Hoffman, contacted Durand about a separate heroin operation that Hoffman wanted to conduct. Shaffer was not involved in this new narcotics operation. With the aid of Durand, the government conducted a supplemental investigation into Hoffman’s heroin operation from approximately September 1980 to May 1981. During the Hoffman investigation, the government compensated Durand for expenses incurred in meeting with Hoffman. Durand also received money that he paid to Hoffman and another subject for their expenses in setting up the smuggling venture. Therefore, while Durand was testifying in the Shaffer grand jury proceedings, he was also operating as a paid informant in the Hoffman investigation.
Before his trial, Shaffer made a specific discovery request concerning: (1) any promises that the government made to Du-rand in exchange for his cooperation; (2) Durand’s tax returns for the time period charged in the indictment; and (3) internal government memoranda regarding Du-rand’s cooperation. Shaffer also made a general request for all material in the government’s possession that was favorable and material to his defense. In response, the government provided Shaffer with a copy of Durand’s grand jury testimony and Durand’s immunity agreement.
The immunity agreement provided, in essence, that: (1) the government would not prosecute Durand for any of his criminal activity in the Shaffer narcotics operation; (2) any information provided by Durand would not be used by the government against him except in a prosecution for perjury; and (3) Durand would not be subject to any criminal tax prosecution through the calendar year 1981, but the U.S. Attorney would nonetheless notify the IRS about any information relative to any civil audit or investigation of Durand. The government stated that this immunity agreement was the complete agreement with Durand; and that no separate secret or other agreement was made with Du-rand.
At Shaffer’s trial, Durand implicated Shaffer in the cocaine operation. Durand testified, inter alia, about the smuggling trips conducted by the conspirators and the enormous profits realized by Shaffer and the others on the cocaine operation. On May 7, 1982, a jury convicted Shaffer of all eight counts.
Approximately two years after his conviction, Shaffer filed a motion for new trial, pursuant to Fed.R.Crim.P. 33, based on newly discovered evidence. As a result of evidence revealed at an evidentiary hearing on this motion, Shaffer contended that the government failed to disclose to him prior to trial: (1) that Robert Durand was a paid informant in Hoffman’s separate heroin operation during the years 1980 and 1981; (2) the full benefits and expense payments that Durand received in exchange for his cooperation in both narcotics investigations; (3) the full extent of assets which Durand acquired through narcotics profiteering; and (4) the fact that the government has failed to initiate any civil tax proceedings against Durand. Shaffer argued that these facts, if used at trial, would have had a substantial effect on Durand’s credibility, and would have resulted in Shaffer’s acquittal. 2
On February 14, 1985, the same district court judge who presided over the trial granted Shaffer’s motion and ordered a new trial. The district court held that “Du- *686 rand’s testimony was critical to Shaffer’s conviction ... [and if] the jury chose not to believe Durand, it is quite possible that Shaffer would not have been convicted.” The district court further held that the information revealed in the evidentiary hearing, if used at trial, “creates reasonable doubt that would not otherwise exist and certainly creates the reasonable possibility of a material effect on the jury.”
On March 11, 1985, the government filed a motion for reconsideration, which was denied by the court on April 29, 1985. On May 28, 1985, the government filed a notice of appeal from both orders. 3
DISCUSSION
A. JURISDICTION
The government asserts that this court has jurisdiction over this appeal pursuant to 18 U.S.C. § 3731. 4 The government maintains that its newly acquired right of appeal in section 3731 became effective when the Crime Control Act [“Act”] was signed into law on October 12, 1984. Accordingly, the government claims that this new right of appeal would apply to the district court’s order of February 15, 1985, granting the new trial motion.
Shaffer contends, however, that the language amending section 3731 will not take effect until November 1, 1986. Shaffer argues that this amending language is subject to the effective date provision set forth in section 225 of the Act. Section 225 of the Act provides that “[t]his chapter shall take effect on the first day of the first calendar month beginning twenty-four months after the date of enactment [i.e. November 1, 1986]____”
Section 225 was enacted as part of Chapter II of the Act. The amendment to 18 U.S.C. § 3731, upon which the government bases its right to appeal, however, is not found in Chapter II of the Act; the amendment was enacted under Chapter XII of the Act.Pub.L. 98-473, § 1206, 98 Stat. 1837, 2153 (1984). Consequently, Shaffer errs in asserting that the amendment to section 3731 is governed by the November 1, 1986 effective date found in section 225 of the Act.
Because neither the statutory language amending section 3731 nor its legislative history specifically prescribes the effective date upon which the statute was to take effect, this issue must be resolved under general principles of statutory construction. “In the absence of an express provision in the statute itself, an act takes effect on the date of its enactment.”
United States v. Clizer,
*687
Applying these principles to this case, we hold that 18 U.S.C. § 3731, as amended by section 1206 of the Crime Control Act of 1984, gives this court jurisdiction to hear the government’s appeal.
See also Nilson Van & Storage,
B. STANDARD OF REVIEW
We review the order granting a motion for a new trial pursuant to Fed.R. Crim.P. 33 for abuse of discretion.
United States v. Steel,
C. DISCUSSION
In
Brady v. Maryland,
Before its decision in
Bagley,
the Court set forth three different standards for determining whether the suppressed or undisclosed information was material so as to deny the defendant his due process right to a fair trial. These three standards for materiality were enunciated in
United States v. Agurs,
In its order of February 14, 1985, the district court held that Shaffer had made both a specific request for information concerning Robert Durand, and a general request for all evidence favorable and material to his defense. The district court, in applying the tests set forth in Agurs and Goldberg, further held that under both the “reasonable possibility” test for specific requests, and the more stringent “reasonable doubt” test for general requests, a new trial was required.
As noted above, however, following the district court’s determination, the Court set forth a new standard for determining when the withholding of Brady material requires the reversal of a conviction.
United States v. Bagley,
— U.S.-,
In
Bagley,
the defendant was charged with narcotics and firearm violations. Before trial, Bagley filed discovery motions, requesting the prosecutor to disclose whether the government paid or promised compensation to any of its witnesses. The government responded by filing affidavits from two government witnesses, each of whom stated he never expected nor received compensation. The defendant was subsequently convicted of the narcotics but not the firearms violations.
Id.
Following his conviction, Bagley moved to vacate his sentence, alleging that the government had withheld
Brady
material from him. Specifically, Bagley contended that the government had failed to disclose to him that two key government witnesses had received compensation from the government both before and after trial.
Id.
at 3378. The district court denied the motion, holding that, even if the agreements with the witnesses had been disclosed, it would not have changed the result at trial.
Id.
at 3379. The court noted that the government witness had testified about the firearms violations and the defendant had been acquitted of those charges.
Id.
We reversed, holding that the failure to disclose this
Brady
material threatened the defendant’s right to cross-examination and required automatic reversal.
Id.; see Bagley v. Lumpkin,
The Supreme Court held that automatic reversal was not required in Bagley’s cáse.
Using the Bagley standard set forth above, we conclude that the information withheld from Shaffer regarding Durand was material and should have been disclosed by the government.
Specifically, Shaffer alleged that the government failed to disclose: (1) that Robert Durand was a paid informant in a separate heroin operation during the years 1980 and 1981; (2) the full benefits and promises that Durand received in exchange for his cooperation; (3) the full extent of Durand’s assets; and (4) the status of Durand’s tax liability. Shaffer argued that these facts, if used at trial, would have had a substantial effect on Durand’s credibility and would have resulted in Shaffer’s acquittal.
Because Durand’s testimony implicating Shaffer was critical to Shaffer’s convic *689 tion, 6 the jury’s assessment of Durand’s credibility was crucial to the outcome of the trial. Therefore, if the jury had not believed Durand, Shaffer may not have been convicted. Consequently, we must determine whether the district court correctly held that the newly discovered evidence, if used at trial, would have discredited Durand.
As noted earlier, evidence affecting the credibility of a government witness has been held to be material under the
Brady
doctrine.
See Giglio v. United States,
We conclude, therefore, that the government’s failure to disclose the impeachment evidence regarding Durand “undermines confidence in the outcome of [Shaffer’s] trial.”
Bagley,
Having concluded that the evidence is material, we must now determine whether the district court correctly held that the information was not adequately disclosed to the defendant. For the rea *690 sons given below, we conclude that the government did not adequately disclose this information to Shaffer.
First, it appears that the government did not give Shaffer sufficient notice of Du-rand’s involvement in the Hoffman heroin investigation. At most, the record discloses that Shaffer was informed that Hoffman was involved in a heroin deal, and that Hoffman had contacted Durand. At no time did the government disclose that Durand was involved in an undercover capacity in the government’s investigation of Hoffman’s heroin operation.
Second, the district court was correct in holding that, while the government did apprise Shaffer’s counsel of tapes that detailed Durand’s involvement, such disclosure was inadequate because the government also told Shaffer’s counsel that these tapes would be of no value to Shaffer’s defense. This later statement by the government negates any disclosure made in the earlier statement.
See Hughes v. Hopper,
The government also makes the unsupported assertion that, because the tapes were disclosed to Shaffer’s co-defendant, they were effectively disclosed to Shaffer. However, because the trial strategies of co-defendants often conflict (i.e., each may seek to place liability solely on the other), we do not think it prudent to allow the government to satisfy its due process requirements to each of several defendants by merely giving exculpatory evidence to one defendant.
With regard to the payment of Du-rand’s expenses, the government asserts, in essence, that Shaffer's counsel was aware of expenses paid to Durand, yet chose not to ask for the details regarding these payments. The government correctly asserts that Shaffer cannot claim a
Brady
violation if he was “aware of the essential facts enabling him to take advantage of any exculpatory evidence....”
United States v. Brown,
In ruling on the evidence surrounding Durand’s civil forfeiture liability, the district court held that the government had failed to disclose that Durand had acquired through his drug profiteering a house in Palm Springs and the funds which would allow him to enter a health spa. The fact that these assets were not disclosed, coupled with the government's failure to proceed in a civil forfeiture action, could be construed to imply a tacit agreement between Durand and the government that the government would not proceed against Du-rand in a civil forfeiture action.
The government contends that, because there was no explicit agreement on this matter, it had nothing to disclose.
See United States v. Hsieh Hui Mei Chen,
*691 This conclusion seems directly applicable to the facts in the instant appeal. The failure to disclose the extent of Durand’s assets is exculpatory material that could indicate the “tip of the iceberg” of a secret deal of leniency.
Finally, the district court was also correct in holding that the government’s failure to pursue Durand’s civil income tax liability was not adequately disclosed to Shaffer. The rationales of Butler and Griggs apply directly to this issue. This undisclosed fact indicates the “tip of the iceberg” of a secret deal that the government would not enforce Durand’s civil tax liability in exchange for his cooperation.
In sum, we hold that the district court did not abuse its discretion by concluding that the Brady information at issue in this case was material to Shaffer’s defense and that the information had not been adequately disclosed. The government’s failure to disclose the Brady information at issue in this case undermines our confidence in the outcome of Shaffer’s trial. Accordingly, we affirm the district court’s order granting Shaffer a new trial.
AFFIRMED.
Notes
. The other three defendants indicted were: James Hoffman, Barron Bingen, and Joseph Hylan.
. We note that Shaffer became aware of Du-rand's role as a paid government informant in the Hoffman investigation only as a result of information disclosed to Shaffer’s trial counsel during his representation of a different defendant in a different trial. The criminal activity surrounding this second trial did not involve Shaffer.
. The government's notice of appeal appears to be untimely because it was filed beyond the thirty day period allowed in 18 U.S.C. § 3731 for the government to appeal an order granting a new trial. However, the filing of a petition for reconsideration within this thirty day period tolls the time for filing the notice of appeal.
United States v. Dieter,
. The government points to the language of section 3731 which authorizes an appeal by the United States from a decision, judgment or order of the district court "granting a new trial after verdict or judgment as to any one or more counts...." Id. This new provision of the statute was added through the Comprehensive Crime Control Act of 1984. Pub.L. No. 98-473, § 1206, 98 Stat. 1837, 2153 (1984) ("the Act").
. Alternatively, the government asserts that this court has jurisdiction because the government has a right to appeal from an order granting relief under 28 U.S.C. § 2255 (collateral attack of a judgment). While it is true that this statute does allow the government to appeal a motion granted under 28 U.S.C. § 2255,
D'Allesandro v. United States,
. Although the government attempted to corroborate Durand’s testimony with the testimony of innocent third parties who accompanied Du-rand and Hoffman on several smuggling trips, this testimony did not corroborate any of the illegal importation and distribution acts detailed by Durand.
. We reject the government’s contention that this type of impeachment strategy, emphasizing the scope of the witness’ cooperation with the government, is not material to warrant a new trial.
See Goldberg,
In Goldberg we went on to hold that: ”[t]he only legitimate purpose to which [this evidence could] have been put is the further illustration of the extent of the [government witness’ cooperation]." Id. This is precisely the purpose for which Shaffer's counsel would have used the evidence at issue in this case.
