Is a witness's memory refreshed by hypnosis admissible?

In an analogous situation, this circuit has held that the current recollections of witnesses whose memories have been refreshed by hypnosis are admissible, with the fact of hypnosis relevant to credibility only. United States v. Adams, 581 F.2d 193, 198-99 (9th Cir.), cert. denied, 439 U.S. 1006, 99 S.Ct. 621, 58 L.Ed.2d 683 (1978). We have cautioned, however, that "[g]reat care must be exercised to insure" that statements after hypnosis are not the product of hypnotic suggestion. Id.