OPINION OF THE COURT
Sotero Sanes appeals from a final judgment and commitment order of the district court. On December 29, 1993, an information was filed charging Sanes with burglary in the first degree, in violation of 14 V.I.C. § 442(1); rape in the first degree, in violation of 14 V.I.C. § 1701(3); robbery in the first degree, in violation of 14 V.I.C. § 1862(2); and possession of a dangerous weapon during the commission of a violent crime, in violation of 14 V.I.C. § 2251(a)(2)(B).
Sanes was accused of attacking Carmen Velez on January 13, 1993 and again on July 14,1993. Counts I, II, III and IV stem from the first attack and Counts V, VI and VII from the second. Sanes was convicted on all counts.
Sanes argues that the district court erred by denying his motion to suppress. He contends that the voice identification procedure was impermissibly suggestive. Further, he argues that the district court abused its discretion by limiting his expert witness' testimony about the validity of the voice identification procedures. Finally, Sanes contends that the district court erred by denying his pretrial motion to sever Counts I, II, III and IV from Counts V, VI and VII, arguing that the charges arose from separate incidents and their joinder was highly prejudicial to him. We will affirm.
I.
Sanes argues that the trial court violated his right to due process by denying his motion to suppress the voice identification. He contends that his voice sample was tainted by outside factors, *464 technical and otherwise, which could have influenced the listener, making it more likely that his voice would be selected. He cites background voices, longer delivery time, different transition time between the statements made in Spanish and those made in English, his monotone and a number of interruptions, as examples of the factors which he believes, when taken cumulatively, compromised the reliability of the identification.
We find no evidence that the procedures used were impermissibly suggestive or that there was a substantial likelihood of misidentification. Ms. Velez heard the voice of her attacker on both January 13, 1993 and July 14, 1993. On each occasion, she conversed with the intruder for ten minutes. She listened to the voice array three times. She was ready to identify Sample No. 4 after the second time, but was encouraged by the police to listen to the tape one more time. Velez then positively identified the fourth voice as that of her attacker. Sample No. 4 was Sanes' voice.
The district court listened to the voice array and found that all of the voices contained unique factors. After listening to Sanes' expert witness on voice identification procedures, the district further found that, although Sample No. 4 was different horn the other samples, the differences did not present a sufficiently significant contrast as to cause misidentification. Before denying Sanes' motion to suppress, the district court applied the eyewitness identification test, enunciated in
Neil v. Biggers,
In
Neil,
the Supreme Court developed a five-part test to test the reliability of an eyewitness identification. The
Neil
factors include the opportunity of the witness to view the criminal at the time of the crime; the witness' degree of attention; the accuracy of the witness' prior description of the criminal; the level of certainty demonstrated by the witness at the time of the confrontation; and the length of time between the crime and the confrontation.
Applying Neil, the district court found that Ms. Velez was alert and had a sufficient opportunity to view or hear her attacker on both occasions and that she presented an accurate description of the defendant and his clothing (which she later identified.) Moreover, she identified the items taken from appellant as looking like items the perpetrator had worn, and there is no evidence indicating that these items, when presented to Ms. Velez, were suggestively linked to either the appellant or to Sample No. 4. Further, Ms. Velez stated that she was certain that Sample No. 4 was the voice of her attacker. Finally, although there was a six-month period between the incidents, only fifteen days elapsed between the last attack and her positive voice identification. We also note that Ms. Velez not only listened to her attacker for a considerable period of time during the two incidents but testified that she engagaed him in conversation in the hope that she could identify his voice, and hence the opportunity and degree of attention criteria of Neil/Manson are met. We also listened to the tape during oral argument, and conclude that the evidence supports the district court's findings and conclusions. We conclude that the district court properly applied the Neil/Manson factors and properly denied Sanes' motion to suppress the voice identification.
II.
Sanes next argues that the district court erred by prohibiting expert testimony comparing voice identification and eyewitness identification. The district court permitted the testimony of Sanes' expert witness, Dr. Harry Hollien, a professor of linguistics, on the question whether the voice exemplar containing the defendant's voice was suggestive. Dr. Hollien was also permitted to comment on the distinguishing characteristics of Sanes' voice sample and *466 their impact, if any, on Ms. Velez's positive identification. However, the district court would not permit Dr. Hollien to explain to the jury why voice identification was not as accurate as eyewitness identification under ideal circumstances.
Under Federal Rule of Evidence 702, "[i]f scientific, technical, or other specialized knowledge will assist the trier of fact to understand the evidence or 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 opinion or otherwise." Whether to allow scientific or technical expert testimony, however, is within the discretion of the district court and is reviewed only for abuse.
United States v. Downing,
Under
Daubert v. Merrell Dow Pharmaceuticals,
Inc.,_U.S--
III.
Finally, Sanes argues that the district court abused its discretion by denying his pretrial motion to sever Counts I through IV from Counts V, VI and VII. He contends that joinder of the counts involving two separate incidents substantially impaired his right to a fair trial. We disagree. Ms. Velez's testimony and a common modus operandi provided sufficient reason to deny Sanes' motion to sever the counts and to conduct a single trial.
*467 Federal Rule of Criminal Procedure 14 provides:
[I]f it appears that a defendant or the government is prejudiced by a joinder of offenses or of defendants in an indictment or information or by such joinder for trial together, the court may order an election of separate trials of counts, grant a severance of defendants or provide whatever other relief justice requires. In ruling on a motion by a defendant for severance the court may order the attorney for the government to deliver to the court for inspection in camera any statements or confessions made by the defendant which the government intends to introduce in evidence at the trial.
Sanes must demonstrate that joinder would result in a "manifestly unfair trial," beyond a mere showing that he would have had a better chance of acquittal with separate trials.
United States v. Eufrasio,
IV.
In sum, we have examined all contentions raised by the appellant and conclude that the district court's decisions were proper in all respects. We will affirm.
