OPINION
Thе sole issue presented is whether the district court erred in excluding the proffered testimony of the defendant’s expert witness concerning psychological limitations on eyewitness identification. We affirm.
I
A man wielding a long-bladed knife robbed a branch of the Bank оf Maryland in Annapolis on the afternoon of February 5, 1992. Robert M. Harris, the defendant, admitted that he had been in the bank twice the morning of February 5. He denied, however, robbing the bank or being in the bank that afternoon.
The evidence at trial established that there were three eyewitnesses to the robbery: Christine Dean, a bank teller; Jeffrey White, a bank teller; and Charlene Watkins, a branch manager. Although immediately after the robbery all three witnesses recalled seeing Harris only once on the morning of February 5, they later testified thаt Harris was in the bank twice that morning. At 10:00 a.m. on February 5, Harris approached White at his teller station and .inquired about opening an account. White and Watkins, who was training White at the time, provided Harris with information on account costs, and after examining a savings aсcounts display, Harris left the bank. He returned at around 11:00 a.m. This time, White directed Harris to the new accounts desk where he spoke with Watkins, who gave him an application to open an account. According to their testimonies, both Dean and White observed Watkins’s interaction with Harris and overheard their conversation. The work station of the tellers is located approximately eight feet from the new accounts desk in the bank lobby.
At about 2:40 p.m., a black male, later identified as Harris, entered the bank and aрproached Watkins in the lobby. Watkins asked him, “You did not bring the paperwork back?” After the man responded, “No,” the two went to the new accounts desk to complete the savings account application. Dean and White, standing at their teller stations, testifiеd at trial that they also overheard this conversation between Watkins and the man. While this man was completing the application, Watkins went to her office, which opened up to the teller stations, for a telephone call. White went to the back of the bank to close up for the day. At approximately 3:00 p.m., this same man approached Dean at her teller station, pushed a chefs hat to her, and demanded, “put all the money in the bag.” He threatened her with a long-bladed knife and ordered her tо comply immediately with his demand. Watkins overheard the demand but White did not. Dean complied with the request, giving the robber approximately $3,400.
The bank’s surveillance camera photographed Harris sitting at the accounts desk at 11:40 a.m., but the photograph did not show his fаce. A second photograph, taken at 3:00 p.m., showed the robber’s profile as he sat at this same desk with Watkins. The FBI identified Harris as a suspect and eight days after the robbery, presented to the eyewitnesses a six-person photospread from which Watkins and White identified Harris as the robber. Watkins claimed she was 100% positive in her identification from these photos, and White declared he was 80% confident. Dean could not identify the robber from the photospread.
Harris was indicted in late February 1992. At his first trial in May 1992, the jury was unable tо reach a verdict. Harris was retried a week later. At the beginning of the *534 second trial and after a jury had been chosen, Harris’s counsel advised the court that it wished to call Dr. John C. Brigham, an expert witness on the reliability of eyewitness identification, to discredit Deаn’s, White’s, and Watkins’s testimonies. After a proffer, the district court refused to admit the evidence. It found that the expert testimony would not be helpful to the jury as required by Federal Rule of Evidence 702. The court was of the opinion that under these circumstances Harris’s identification was not truly at issue. It also ruled that even if the eyewitness testimony created issues of credibility, the jury could resolve them without an expert’s assistance. At trial, Dean, White, and Watkins testified, and all identified Harris as the robber through his looks, demean- or, and voice. 1 On Mаy 28, 1992, the jury found Harris guilty of armed bank robbery in violation of 18 U.S.C. § 2113(d). Harris moved for a new trial, challenging the district court’s exclusion of his expert’s testimony. The court denied this motion relying on its original reasoning and further declared the evidence inadmissible because its prejudicial effect outweighed its probative value under Federal Rule of Evidence 403. The district court subsequently sentenced Harris to seventy months’ confinement. Harris appeals.
II
Harris’s only assertion of error is the district court’s exclusion of his expert’s testimony on the reliability of eyewitness identification. The expert would have testified, among other things, that the memories of Dean, White, and Watkins were unreliable because: (1) they discussed the bank robbery among themselves, and these discussions could have strengthened their misidentifications аnd their confidence in these identifications; (2) the stress of the bank robbery could have clouded their memories; (3) Harris had been in the bank two times earlier on the day of the robbery, they could have transposed the shape of his face or his other generаl features to the robber’s; and (4) their memories could have been distorted over time.
Federal Rule of Evidence 702 sets the standard for the admissibility of expert testimony. It provides that
[i]f scientific, technical, or other specialized knowledge will assist the trier of fаct to understand the evidence or to determine a fact in issue, a witness qualified as an expert by knowledge, skill, experience, training, or education, may testify thereto in the form of an opinion or otherwise.
Fed.R.Evid. 702. As Rule 702 indicates, expert testimony is only pеrmitted if it assists the trier of fact to understand evidence or to determine a fact in issue.
Persinger v. Norfolk & W. Ry.,
Until fairly recently, most, if not all, courts excluded expert psychological testimony on the validity of eyewitness identification.
See, e.g., United States v. Thevis,
These narrow circumstances such as described in
United States v. Downing,
3
Finally, any discrepancies in these testimonies were brought out or could have bеen brought out on cross-examination.
See Curry,
In view of the above, the judgment of the district court is affirmed.
AFFIRMED. ■
Notes
. Both Dean and Watkins testified that Harris was a black man with a round face, approximately 5' 6" to 6' tall. All three eyewitnesses further testified that Harris wore a jacket on the morning of the robbery and that when he returned to the bank in the afternoon, he wore a long, dark overcoat.
. The feedback factor demonstrates "that witnesses who discuss the case with each other may unconsciously reinforce mistaken identifications” and their certainty in these identifications.
United States v. Moore,
. In
Downing,
the Third Circuit reversed the district court’s ruling that expert testimony on the reliability of eyewitness identification was per se inadmissible. The
Downing
court declared that under certain narrow circumstances, similar to those we have identified above, "expert testimony on the reliability of eyewitness identifications can assist the jury in reaching a correct decision and therefore may meet" the helpfulness requirements of Rule 702.”
United States v. Downing,
. Even if the circumstances had matched the
Downing
pattern, defense-counsel’s advice and presentation to the court on the first day of trial hardly gave the government adequate notice of his intention to use an expert witness.
See Curry,
