Charles Lynch and Michael Bauer at a joint jury trial were convicted of first-degree murder, see 18 U.S.C. § 1111 (Supp. II 1984), conspiracy to murder, see 18 U.S.C. § 1117 (1982), and possession of a weapon while inmates at a federal correctional facility. See 18 U.S.C. § 1791(a)(2) (Supp. II 1984). On appeal both argue that the district court 1 erred in denying their motions for severance and in refusing to instruct the jury on the lesser-included offense of manslaughter. Bauer in addition argues that certain incriminating statements used against him were obtained in violation of his constitutional rights, while Lynch raises a variety of challenges regarding limitations on cross-examination and on the admissibility of impeachment evidence. Finally, both defendants question the sufficiency of the evidence against them. We affirm.
Lynch, Bauer, and the victim, William Finley, at the times relevant to this proceeding were all inmates at the Sandstone, Minnesota, Federal Correctional Institution. The government introduced evidence that Lynch and Finley had been involved in marijuana trafficking at the prison and that a dispute had developed between them *767 when Finley failed to deliver marijuana for which Lynch allegedly had paid. Several inmates testified that at times during November and December 1984 Lynch had made threats against Finley, and in one of these threats Lynch allegedly had asserted that he knew a karate expert whom he would send after Finley. The government introduced testimony that Bauer, in addition to having had a close relationship with Lynch, appeared to have had some training in martial arts.
On December 20, 1984, according to witnesses, Lynch and Finley again argued and Lynch again threatened Finley. Bauer allegedly was present during this encounter, and an inmate testified that immediately after Finley left he had observed Bauer and Lynch talking together quietly and laughing. Lynch then warned this inmate to leave the area because there would be trouble there soon.
A short while later Finley was stabbed in the stomach in the corridor outside the prison gym. An inmate testified that while looking out his cell window he had observed Bauer making punching motions toward the midsection of a black inmate (Finley was black) while the inmate was held from behind by a large man in a dirty white kitchen jacket — a description that could have fit Lynch. Another inmate testified that he had seen Finley walking in the direction of Lynch and Bauer. When the inmate turned around a few minutes later he saw Finley lying wounded on the gym floor. Two other inmates testified respectively to having seen Bauer running from the scene and washing blood off his hands. Finally, an inmate testified that Bauer had admitted to stabbing Finley for $5,000.
The murder weapon was a knife which was discovered missing from the prison’s kosher kitchen on a day when, according to prison records, Lynch had been working there. An inmate testified that on that same day he had seen Lynch with a knife wrapped in newspaper.
I.
As an initial matter, Lynch and Bauer argue that they should have been tried separately. Each argues that there was greater evidence of the other’s guilt and that the jury could not reasonably have been expected to properly compartmentalize the evidence. In addition, Bauer argues that the mutual antagonism between his and Lynch’s defenses required severance.
In reviewing these claims we first note that “[generally, persons charged in a conspiracy or jointly indicted on similar evidence from the same or related events should be jointly tried.”
United States v. Robinson,
Here, the charges and evidence were relatively simple and straightforward and were not “so extensive, complicated, or confusing that the jury would be unable to consider the guilt of the two defendants independently.”
See United States v. Nabors,
Even taking these arguments for severance cumulatively, we cannot find the abuse of discretion and great prejudice necessary to reverse the district court.
See Robinson,
II.
Lynch and Bauer next argue that they were entitled to have had the jury instructed on the lesser-included offense of manslaughter (a second-degree murder instruction was given) because evidence introduced at trial raised a question whether the stabbing might have resulted not from malice but from sudden anger as Lynch and Finley continued quarreling over their marijuana transaction.
A defendant is entitled to a lesser-included offense instruction only if “the evidence adduced at the trial provides a rational basis upon which the jury could find [the defendant] not guilty of the greater but guilty of the lesser offense.”
United States v. Elk,
III.
Bauer claims that the district court erred in admitting into evidence a series of incriminating notes he passed to an inmate named Robinson and several incriminating statements he made to an inmate named Williams because Robinson and Williams deliberately solicited the communications at
*769
the urging of the government, thus subjecting Bauer to the equivalent of interrogation in the absence of counsel in violation of his rights under the fifth and sixth amendments.
See United States v. Henry,
The events of which Bauer complains occurred while he was housed in the segregation unit at Sandstone subsequent to the stabbing but prior to his indictment on the murder charge; thus, as the Supreme Court recently made clear, his sixth amendment right to counsel had not yet attached.
Moran v. Burbine,
— U.S. -,
Bauer further argues that the
Henry
prohibition on the use of undercover police informants should be applied through the fifth amendment to protect suspects in custody who otherwise would be entitled to
Miranda
warnings
(see Miranda v. Arizona,
Robinson in testimony at trial admitted he was attempting to get Bauer to write about the stabbing, transcript at 1012, 1014, but he denied that the government asked him to so proceed.
Id.
at 933, 934. Robinson further testified that an officer at the jail requested that he stop writing notes to Bauer,
id.
at 934, and that the FBI merely indicated that it wasn’t going to interfere with the correspondence. The cooperation of jail guards in transmitting some of the notes between Robinson and Bauer was not government involvement in or special facilitation of the Bauer-Robinson relationship; it was the standard practice at Sandstone.
Id.
at 839-40. The facts before us thus are similar to those in
Surridge, supra,
where the police knew that an individual visiting the defendant in jail was going to try to learn the whereabouts of the stolen money. This court in
Surridge
concluded that mere knowledge was not a sufficient government involvement to implicate fifth or sixth amendment concerns,
The incriminating statements introduced through the testimony of Williams require a different analysis. Williams admitted at trial that he had been asked by a jail officer to see what he could find out about the stabbing, transcript at 1196, 1215, and the conversations to which Williams testified clearly show that he deliberately provoked two incriminating statements by Bauer — “Man, this * * * is going to a nightmare,” and “I didn’t mean for him to die.”
Id.
at 1207-09. Under the harmless error rule, however, admission of these statements is not a ground for reversal if there remains “overwhelming inde
*770
pendent evidence” of Bauer’s guilt.
See Flittie, 755
F.2d at 944 (quoting
United States v. Packer,
IV.
Lynch argues that the trial court by sustaining numerous evidentiary objections improperly prevented him from fully developing the untruthfulness and bias of the prosecution's witnesses. In particular, Lynch argues that he could have shown that the inmates who testified for the prosecution, many of whom when initially questioned by authorities denied having knowledge relevant to the stabbing, picked up prison gossip and fabricated plausible stories with the hope that, by “cooperating” with the government, they would receive favorable treatment (for example, transfers and early releases).
A careful review of the record reveals that Lynch indeed was allowed to explore extensively all aspects of this theory. The district court limited Lynch’s presentation only when, for example, Lynch sought to introduce extrinsic evidence of prior conduct of the witnesses bearing on their veracity — evidence inadmissible under Rule 608(b) of the Federal Rules of Evidence — or sought to impeach witnesses with prior inconsistent statements without having given them the opportunities to explain required by Rule 613(b) of the Federal Rules of Evidence. With regard to the latter point, Lynch argues that the court erred in finding the foundations for the inconsistent statements inadequate under the “relaxed” requirements of Rule 613(b) or, in the alternative, that the court erred in refusing to allow the recall of prosecution witnesses so foundations could be laid. Lynch, however, cites no precedent holding that the foundation requirement may be so relaxed that counsel need not inform the witness of either the time, place, or circumstances of the alleged inconsistent statement; and the district court’s refusal to allow recall of certain witnesses was based on considerations of judicial efficiency that we cannot second-guess, given the extensive discussions in the record of the logistical difficulties of dealing with inmate witnesses.
The district court’s limitations on Lynch’s cross-examination served only to foreclose litigation of collateral issues and thus to prevent delay and confusion. Whether Rule 608(b) permits inquiry into, for example, prior instances of untruthfulness by a witness, is not at issue here. Rule 608(b) by its own terms merely allows — but does not require — a court to permit such cross-examination,
e.g., Crimm v. Missouri Pacific Railroad,
*771 V.
Finally, Lynch’s and Bauer’s arguments that the evidence was insufficient to support their convictions cannot stand in the face of the testimony outlined above, which must, of course, be taken in the light most favorable to the jury’s verdict.
See United States v. Robinson,
The convictions are affirmed.
Notes
. The Honorable Donald D. Alsop, Chief Judge, United States District Court for the District of Minnesota.
. The case on which Bauer relies,
United States v. Bostic,
. Lynch and Bauer both assert that the alleged statement of Bauer that he hadn’t meant for Finley to die negated the existence of malice. We observe, however, that malice does not require proof of a subjective intent to kill but may be established by evidence of conduct which is sufficiently wanton and reckless to support an inference that the defendant was aware of a serious risk of death or grave bodily harm.
United States v. Black Elk,
