History
The Federal Rules of Evidence adopted in 1975 (and their state counterparts) expressly allowed expert testimony to include statements on ultimate issues if such statements will be helpful to the judge or jury. In 1984, Federal Rule of Evidence 704(b) was added following the trial of John Hinckley, Jr. for the attempted assassination of U.S. President Ronald Reagan. The changes were in part a result of the public backlash due to Hinckley's successful use of the insanity defense. These changes, in particular Rule 704(b), put limits on expert witness testimony.
The new rules of evidence restrict the testimony allowed on the ultimate issue. Rule 704(b) states that the mental health expert may testify to the defendant's mental disorder or defect and its symptoms, but may not offer a conclusion on an ultimate issue such as the sanity or insanity of the defendant. The expert witness must refrain from merely giving the jury a conclusion that pertains to the legal issues at hand and cannot testify to legal conclusions (ultimate issues), the rationale being that mental health professional are not attorneys. Judicial discretion remains in determining the limits of testimony as well, such that any testimony that "wastes time' or is irrelevant can be barred. The rationale for this restriction was stated in the legislative history of the rule as the following:
The purpose of this amendment is to eliminate the confusing spectacle of competing expert witnesses testifying to directly contradictory conclusions as to the ultimate legal issue to be found by the trier of fact.
The result is that large gray areas remain regarding exactly what testimony is allowed. For example, the Third Circuit Court of Appeals in United States v. Rutland ruled that testimony from "an extraordinarily qualified handwriting expert" was admissible on the "ultimate issue of authorship of key documents".
Read more about this topic: Ultimate Issue (law)
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