USA Introduction to the Standard of Expert Witness Testimony
The Daubert/FRE 702 framework, with particular attention to testimony on ancestry, descent, tribal status, and community affiliation
This introduction is written for advocates and experts who must understand how U.S. federal courts evaluate the expert, the methodology, and the fit between the proffered opinion and the actual issue in dispute. It treats the Daubert/FRE 702 framework as a single integrated inquiry rather than a checklist, and it gives particular attention to the issues that arise when experts testify on ancestry, descent, tribal status, or community affiliation — areas where the methodology question and the fit question are most likely to be the decisive ones at the gatekeeping stage.
The four pillars of the Daubert/FRE 702 inquiry
- Qualification — the expert's knowledge, skill, experience, training, or education must be sufficient to form a reliable opinion on the specific issue, not on the general subject area. An expert qualified on a related question is not for that reason qualified on the question actually before the court.
- Reliability of methodology — the methodology must be reliable in its own field; reliability is assessed against published standards, peer review, error rates, and acceptance within the relevant scholarly or professional community. The Guide treats reliability as a question about the method itself, separate from the application of the method in the particular case.
- Reliable application — the expert must reliably apply the methodology to the facts of the case, with documentation sufficient to allow opposing counsel and the court to test the application step by step.
- Fit — the opinion must "fit" the issue actually in dispute. An opinion that is reliable on a related question but does not reach the question presented does not satisfy FRE 702 even if it is otherwise rigorously formed.
Particular attention to ancestry, descent, tribal status, and community affiliation
The Guide gives sustained attention to the issues that recur in cases where the expert is offering an opinion on a litigant's ancestry, descent, tribal status, or community affiliation. These are areas in which the methodology question is rarely contested in the abstract but routinely fails on the application or fit prong, and in which qualification questions can become outcome-determinative because of the limited number of recognized methodologies and the small number of qualified practitioners. The Guide identifies the recurring failure modes and the documentation an expert should produce in order to avoid them.