(a) Government's Disclosure. (1) Information Subject to Disclosure. (G) Expert Witnesses. — At the defendant’s request, the government must give to the defendant a written summary of any testimony that the government intends to use under Rules 702, 703, or 705 of the Federal Rules of Evidence during its casein-chief at trial ... The summary provided under this subparagraph must describe the witness’s opinions, the bases and reasons for those opinions, and the witness’s qualifications. Fed.R.Crim.P. 16(a)(1)(G). 3 . Because we conclude that there was no violation of Fed.R.Crim.P. 16, there is no need to consider the issue of whether any possible violation of that rule was prejudicial to Barrett’s substantial rights. See United States v. Lopez, 271 F.3d 472, 483-84 (3d Cir.2001)
holding that violation of rule 16 in that case was not harmless error holding that prosecutorial error does not warrant reversal unless substantial prejudice results holding that any prejudice or technical violation of rule 16 is insufficient to comprise a deprivation of the defendants constitutional rights and therefore upholding his conviction holding that reversal is proper only when a rule 16 violation results in prejudice to substantial rights holding that the violation of a rule of procedure prescribed by this court does not call for a reversal of a conviction unless the record discloses that noncompliance with rule resulted in prejudice or harm to the defendant