OPINION OF THE COURT
Williаm Harry Brink appeals his conviction for bank robbery. Brink contends the government violated his Sixth Amendment right to counsel by placing him in a cell with a known informant in a deliberate attempt to elicit self-incriminating statements. He also contends the district court erred by allowing him to introduce an eyewitness’ prior identification only for impeachment purposes, rather than as substantive evidence. Although Brink has made a colorable Sixth Amendment claim, the record before us is inadequate to resolve it because the district court denied Brink’s request for an evidentiary hearing. Therefore, we will vacate the judgment of conviction and sentence and remand for an evidentiary hearing to decide that issue.
I. Facts and Procedure
On December 16, 1992, a masked gunman robbed the Farmers National Bank in East Brady, Pennsylvania and stole $4,434.00 in cash. Brink was arrested for the crime and charged with bank robbery, 18 U.S.C. § 2113(a) (1988); armed bank robbery, id. *421 § 2113(d); and use of a firearm in a crime of violence, id. § 924(c).
Before trial, Brink was confined to Clarion County prison where he shared a cell with Ronald Scott. After learning Scott was scheduled to tеstify at his trial, Brink discovered Scott had been an informant for the Pennsylvania State Police and the Federal Bureau of Investigations on five previous occasions. Brink requested a pre-trial evi-dentiary hearing to determine Scott’s involvement with the State Police and the FBI. The court denied Brink’s motion. At trial, Scott testified that, while in Clarion County prison, Brink confessed to committing the bank robbery and admitted to manufacturing an alibi.
The principal eyewitnesses at trial were Annette Miller and Marilyn Ann Simpson, two bank tellers on duty at the time of the robbery, who identified Brink as the robber after testifying that they knew him both as a customer and from prior associations. They based their identifications on the visible parts of his face, his mannerisms and his voice. Miller stated that although she got a good look at his eyes, she could not remember what color they were. An FBI agent, however, testified that the day after the robbery, Miller told him the robber had dark eyes. 1
The prosecution also introduced photographs taken by bank surveillance camеras, 2 testimony that Brink had been seen with stacks of money the night after the robbery, and evidence that $220 was found in the sofa of a house where Brink had been doing construction work during the week of the robbery. 3
In defense, Brink offered the testimony of John Olcus, his neighbor, and Natalie Reefer, a mail carrier. Olcus testified that he saw Brink at his house at or near the time of the robbery. 4 Reefer, who did not know Brink but was standing with Olcus when a car drove up to Brink’s home around the time of the robbery, testified that she saw a red Subaru drive up to Brink’s housе and that Olcus told her Brink was the driver.
A jury found Brink guilty on all three counts. Brink filed a motion for a new trial, which the court denied. This timely appeal followed. We have jurisdiction under 28 U.S.C. § 1291 (1988).
II. Right to Counsel
Over objection, Brink’s pre-trial cellmate, Ronald Scott, testified that, while in Clarion County prison, Brink told him that he robbed the Farmers National Bank and how he devised an alibi. Brink contends the government violated his Sixth Amendment right to counsel by placing him in a cell with Scott because, he claims, Scott was a government agent deliberately attempting to eliсit incriminating evidence outside the presence of Brink’s counsel. We apply plenary review to the district court’s application of legal precepts,
see Gregoire v. Centennial Sch. Dist.
The deliberate use of jailhouse informants to elicit incriminating information may violate a defendant’s right to counsel.
United States v. Henry,
In
United States v. Henry,
the Court reaffirmed the principles of
Massiah
on facts similar to this case. Like here, the defendant in a bank robbery prosecution challenged the admission of his pre-trial cellmate’s testimony on the grounds that the cellmate was a government agent.
Massiah
and
Henry
establish that the government violates a pre-trial detainee’s right to counsel when it deliberately creates a situation in which a prisoner is likely to make incriminating statements,
Henry,
In
Kuhlmann v. Wilson,
the Court held that where a prisoner makes incriminating statements to a passive listener — a “listening post” — the introduction of the prisoner’s statements does not violate his right to counsel because the informant’s presence does not constitute an interrogation.
Henry
and
Kuhlmann
set the bounds for using a prisoner’s self-incriminating statements made to jailhousе informants. The government violates a prisoner’s right to counsel when it places that prisoner in a cell with a jailhouse informant who “deliberately use[s] his position to secure incriminating information from [the defendant] when counsel was not present.”
Henry,
In finding the government deliberately elicited statements from the defendant in
Henry,
the Court fоund three factors to be significant: (1) the informant acted under instructions as a paid informant for the government;
5
(2) the informant appeared to be just another inmate; and (3) the defendant was in custody at the time the informant engaged him in conversations.
In this case, even though Scott maintains he was not instructed to question Brink about the robbery, there is some evidence that Scott deliberately elicited information from Brink.
6
On this record, however, it is unclear whether Scott was acting as a government agent while sharing Brink’s cell. An inmate who voluntarily furnishes information without instruction from the government is not a government agent, even if the informant had been an agent in the past.
See United States v. Van Scoy,
But the record also contains evidence suggesting that Scott may have had a tacit agreement with the government. Scott testified that he began informing in the hopes of having his sentence reduced. The government trained him as an informant and at one point a government agent told Scott that his cooperation would be reported to the United States Attorney and the Attorney General. 8 Therefore, Scott may have informed on Brink on the reasonable assumption that government offiсials were aware of his actions and would reward him in the future, if not presently, with a recommendation for a reduction in his sentence.
It is also significant that after Scott began informing, the government placed him in a cell with a pretrial detainee. Scott testified that a state trooper approached him while he was sharing a cell with Brink to ask if Brink had given Scott any information about the crime. Since the government was aware of Scott’s propensity to inform on his cellmates, we believe that рlacing him in a cell with a pretrial detainee could represent a deliberate effort to obtain incriminating information from a prisoner in violation of his Sixth Amendment right to counsel.
Cf. Henry,
We believe Brink has raised a colorable claim that the government violated his constitutional right to counsel by placing him in a cell with a known informant who may hаve been acting as a government agent. In these instances, the trial court should conduct an evidentiary hearing and make the necessary findings since such conduct, if proven, could violate a defendant’s rights under the Sixth Amendment. 9 Because the district court declined to hold an evidentiary hearing, we will vacate the judgment of conviction and sentence and remand for a hearing to determine whether Brink’s rights under the Sixth Amendment were violated. Should the district court make this determination, Brink will be entitled to a new trial.
III. Prior Identification
At triаl, bank teller Annette Miller testified she was unable to recall the bank robber’s eye color. FBI Agent McEachern testified that the day after the robbery, Miller told him the bank robber had dark colored eyes. Brink, whose eyes are light hazel, sought to use Miller’s prior statement as substantive evidence of his innocence, but the court refused and instead gave the following instruction:
*425 You will recall that certain witnesses who testified during the trial had made statements before this trial about matters at issue in this case. These earliеr statements were brought to your attention to help you decide if you believe that witness’ testimony. You cannot use these earlier statements as evidence in this case.
Brink contends the district court erred because Federal Rule of Evidence 801(d)(1)(C) allows statements of prior identification to be admitted as substantive evidence.
a.
At the outset we must determine the proper scope of review. The government contends our review should be for plain error. Generally, we review evidentiary rulings for аbuse of discretion,
see, e.g., In re Merritt Logan, Inc.,
Brink challenged the instruction, stating, “With regard to identification, we believe that under the federal rules it is not hearsay.” The government maintains Brink’s statement was not specific enough to constitute an objection. We disagree. Although Brink did not mention Rule 801(d)(1)(C) expressly, his objection was sufficiently specific to inform the district court.
Cf. Santos,
b.
The Federal Rules of Evidence provide “A statement is not hearsay if ... one of identification of a person made after perceiving the person.” Fed.R.Evid. 801(d)(1)(C) (West 1994). Statements of prior identification are admitted as substantive evidence because of “the generally unsatisfactory and inconclusive nature of courtroom identifications as compared with those made at an earlier time under less suggestive conditions.” Fed.R.Evid. 801, Notes of Advisory Committee on 1972 Proposed Rulеs; see S.Rep. No. 199, 94th Cong., 1st Sess. 2 (1975) (“Both experience and psychological studies suggest that identifications consisting of non-suggestive lineups, photographic spreads, or similar identifications, made reasonably soon after the offense, are [more] reliable than in-court identifications.”). “Admitting these prior identifications therefore provides greater fairness to both the prosecution and the defense in a criminal trial.” Id.
*426
Generally, evidence is admitted under Rule 801(d)(1)(C) when a witness has identified the defendant in a lineuр or photospread, but forgets, or changes, his testimony at trial.
See, e.g., United States v. O’Malley,
Moreover, the fact that FBI agent McEac-hern, rather than Miller, recited Miller’s statement at trial does not preclude introducing her statement as substantive evidence. Debate on the 1975 amendment to the Rule demonstratеs Congress was aware that third parties would testily to the witness’s prior statements. See 121 Cong.Ree. 31,867 (1975) (statement of Rep. Hungate) (“The bill ... applies to situations where an eyewitness has previously identified a person out of court. It would admit into evidence testimony of that identification. For example, testimony by a police officer that at a lineup John Doe identified the defendant as the man who robbed his store.”). See generally, Jack B. Weinstein and Margaret A. Berger, Wein-stein’s Evidence, ¶ 801(d)(l)(C)[01], at 801-222 (1993) (“If at trial the eyewitness fails to remember or denies that he made the identification, the previous statements of the eyewitness can be proved by the testimony of a person to whom the statement was made, and the statement can be given substantive effect.”). Thus, Miller’s statement should have been admitted as substantive evidence.
c.
The government maintains that Brink is not entitled to a new trial because the district court’s error, if any, was harmless. Like resolution of Brink’s Sixth Amendment claim, resolving this issue depends on whether Scott was acting as a government agent whilе collecting information on Brink.
Under Federal Rule of Criminal Procedure 52(a) “any error, defect or variance which does not affect substantial rights shall be disregarded.” Fed.R.Crim.P. 52(a) (West 1994). An error that does not implicate a constitutional right is harmless where it is “ ‘unimportant in relation to everything else the jury considered on the issue in question as revealed in the record.’ ”
United States v. Palmieri,
Scott testified that, when they were cellmates, Brink confessed to the robbery. The bank tellers, Miller and Simpson, made positive in-court identifications 11 and Brink’s *427 friend, William Rumbarger, testified that on the evening after the robbery, he saw Brink carrying two, three-quarter inch stacks of cash in large denominations. These, together with other circumstantial evidence, provide sufficient evidence of Brink’s guilt. 12
If Scott did not violate Brink’s Sixth Amendment rights his testimony was properly allowed into evidence.
See Kuhlmann,
IV. Conclusion
For the foregoing reasons, we will vacate the judgment of the' district court and remand this case for further proceedings not inconsistent with this opinion.
Notes
. Brink has light hazel eyes.
. The pictures taken were inconclusive as to the robber’s identity.
. Two FBI expert witnesses also testified. A photography expert testified to five similar features between the denim jacket worn by the robber in the surveillance photographs and a jacket obtainеd from Brink's home. A firearms expert testified that the gun in the photographs was a revolver, as was the gun obtained from Brink's home. Both experts stated they could not positively identify the objects in the photographs as the objects in evidence.
.Brink’s house is approximately 4'/i miles from Farmers National Bank. Olcus testified it would take at least 10 minutes to drive from the bank to Brink's house.
. Although the Supreme Court emphasized the fact that the informant was “paid”,
. The district court did not make a finding on whether Scott elicited information from Brink, but there is a colorable claim that Scott may have been more than just a listening post. On cross-examination, at trial, Scott admitted that when acting as a government agent his method of obtaining information was to lie to his cellmates to gain their trust. Scott admitted lying to Brink, and acknowledged he had gained Brink’s trust. Scott also discussed Brink's case with him, telling Brink he thought Brink was guilty, *424 and even discussed the possibility of Brink escaping during a break in the trial.
. Scott admitted to volunteering to be a government informant in 1990 or 1991. Since then he has informed on at least six inmates in three jails or prisons.
. This case is unlike
Van Scoy,
where the informant did not receive any favorable treatment from the FBI,
. "Most constitutional errors have been held amenable to harmless-error analysis."
Sullivan v.
Louisiana, - U.S.-, -,
. The plain error doctrine “is intended to correct errors that are 'obvious' or that otherwise seriously affect the fairness, integrity or public reputation of judicial proceedings.”
Government of Virgin Islands v. Charleswell,
. Simpson testified:
Q: How do you know that Billy Brink robbed you on December 16, 1992?
A: I could tell who he was. I could see through the ski mask. The holes around the eyes and the mouth were big enough to see. I could recognize his features, his voice, the way he walked, his mannerisms.
Q: Now you have identified several characteristics. Did you know Billy Brink prior to December 16, 1992.
A: Yes, I did.
Q: And how was it that you knew him or knew of him?
A: I knew of him all his life. My son coached him in midget football, I think junior high, and probably varsity football also. But, I just know that he — you know, I have known of him.
Q: Now, was he a customer of the Farmers National Bank?
A: Yes, he was.
Q: When was the last time you had seen him in the bank prior to December 16th.
A: Probably around the first week in December he was in the bank.
Appendix at 94.
Miller testified:
Q: And how is it that you were able to identify [Brink]?
A: Just — when he came to the window, it was him. I mean, from what I know of him and seen оf him, it was Bill Brink.
Appendix at 110.
Q: [Y]ou knew him because one of his friends was dating your best friend. Is that how you knew him?
A: That's how I knew who he was at first, yes.
Q: And then you also saw him play football. Is that what your testimony is?
*427 A: Yeah. I saw him play football and, I mean, we went to two small high schools. I mean, everybody knew who everybody was in the two schools.
Appendix at 114.
. Claiming the pre-trial identifications of Miller and Simpson were subject to the same limiting instruction as Miller’s statement regarding the robber’s eye color, the government contends the jury was instructed not to view their testimony as substantive evidence, but instead to use it tо judge their credibility. Consequently, the government maintains that limiting the use of Miller's statement about the robber's eye color, if error, was harmless because the court's instruction hurt the government's case more than the defendant's. Although we find the government’s argument unconvincing, we agree the error was harmless.
. Brink raises two other issues on appeal. He claims the district court erred by not interrupting jury deliberations to allow him to demonstrate that the denim jacket, taken from his home and entered into evidence on the theory that it was worn during the robbery, did not fit him. After jury deliberations begin, a district judge has wide discretion in deciding whether to reopen a case.
United States v. Golomb,
Brink also contests the district court's ruling that allowed two experts to testify about similarities between items seized from Brink's home and those identified on the bank’s surveillance photographs. Brink argues that because these experts were unable to testify to a reasonable degree of scientific certainty, their testimony should have been stricken as conjecture. We find no merit in this argument. The decision whether to admit expert testimony is within the broad discretion of the trial court,
United States v. Downing,
