Before Retaining a Rebuttal Expert: A More Focused Approach to Challenging a Custody Evaluation

When a custody evaluation comes back with recommendations a client strongly disagrees with, one of the first strategic questions counsel may consider is whether to retain a rebuttal expert.

Sometimes that is exactly the right decision. In other cases, a more useful first step may be consultation focused on understanding the evaluator's reasoning, identifying the issues that actually matter, and preparing a disciplined cross-examination. The point is not that rebuttal experts lack value. The better question is whether the case actually requires another expert opinion.

What the Witness Chair Teaches

Years of conducting custody evaluations and testifying about my work have changed the way I think about cross-examination. Some questions genuinely test the evaluator's reasoning. They identify an assumption, expose a limitation, or draw attention to an inference that may extend beyond the available information. Other questions may establish an inconsistency without changing the underlying analysis in any meaningful way.

The strongest examinations tend to have a clear theory and a logical sequence. Counsel knows what point is being developed, what answer is likely to follow, and how the next question will build on it. When an examination jumps between topics or the likely answer has not been fully anticipated, even an important point can lose its force.

There have been times during testimony when I knew the question I wished counsel would ask next. Not because the answer would necessarily weaken my opinion, but because the question went directly to the analysis. What information supported the conclusion? What information pointed in another direction? Was another explanation considered? How were conflicting sources reconciled? What information was missing? Did an acknowledged limitation affect the confidence that should be placed in the recommendation?

Those are not gotcha questions. They are questions about reasoning. That experience has made me increasingly interested in consultation as a way to help attorneys think through not only what to ask, but why the question matters and where the examination should go next.

Another Opinion Is Not Always the Same as a Better Challenge

By the time a rebuttal expert becomes involved, much of the original evaluative process has already occurred. The evaluator has conducted interviews, gathered collateral information, reviewed records, made observations, weighed competing accounts, and reached conclusions. A subsequent reviewer may identify important analytical or methodological concerns, and there are cases in which those concerns warrant affirmative expert testimony.

It is useful, however, to distinguish between two inquiries: could another qualified professional reasonably reach a different conclusion, and does this evaluator's conclusion adequately follow from the information and reasoning used to reach it? Those questions overlap, but they are not the same.

Family systems are complex. Competent professionals can assign different weight to the same information. Once a case becomes primarily a contest between two professional interpretations, the court may be left deciding which expert it finds more persuasive. In another case, the better approach may be to stay closer to the original work: what did the evaluator know, what was inferred, were reasonable alternatives considered, and did identified limitations affect the strength of the recommendation? That type of examination does not always require a second custody opinion.

How Evaluators Build an Opinion

Complex custody evaluations may involve hundreds or thousands of parent submissions, along with mental-health, medical, school, and law-enforcement records, professional and collateral interviews, parent and child interviews, and direct observations. The final report is not simply a summary of those materials. It is an act of synthesis.

The evaluator must decide what information is reliable, what weight to assign it, how to reconcile competing accounts, and what conclusions can reasonably be drawn from the whole. That is why isolated error-finding is often not enough. A date that is off by several days may have little effect on the analysis. A conclusion that several isolated events establish a persistent behavioral pattern may matter considerably. An evaluator may accurately describe the facts but move too quickly from those facts to an explanation for why something occurred.

Meaningful review therefore requires more than identifying sentences in the report that appear problematic. It requires understanding how the evaluator moved through the information and whether the conclusions are proportionate to the data supporting them. Professional competence does not require infallibility. An evaluator can be thoughtful, experienced, and highly regarded while still making an inferential leap in a particular case that deserves examination.

Professional respect and scrutiny of the work are not incompatible. The task is not to decide whether someone is a good evaluator. It is to determine whether the reasoning in this case is adequately supported. A consultant can help counsel distinguish an issue that materially affects the analysis from one that merely looks inconsistent on paper. Sometimes the most useful advice is not, 'Ask this question.' It is, 'That point is unlikely to take you anywhere. Follow this thread instead.'

Custody Litigation Is Interdisciplinary Work

Family-law attorneys routinely work with subject matter that extends beyond legal doctrine. Custody litigation may involve psychological functioning, mental-health diagnoses, child development, family systems, substance misuse, trauma, assessment methodology, and behavioral science. Attorneys can develop considerable knowledge in these areas through practice and continuing education, but their core professional education is legal.

The reverse is also true. Mental-health professionals working in forensic settings must understand the legal context in which their opinions will be used. That does not make them lawyers.

AFCC's 2022 Guidelines for Parenting Plan Evaluations in Family Law Cases reflect this interdisciplinary reality. The Guidelines identify the education, training, and competence expected for this work and place parenting-plan evaluation within a legal context. McNamara and Lund (2023) likewise describe parenting-plan evaluation as a forensic subspecialty with rigorous expectations for training, skill, and knowledge. They also note heightened scrutiny of evaluators' work and continuing pressure related to cost and access.

No single profession owns all of the knowledge involved in these cases. That is not a deficiency in either discipline. The attorney brings legal analysis, evidentiary judgment, trial strategy, and knowledge of the case. A consultant with behavioral-health and forensic training brings a different lens. The purpose is not for the attorney to become the evaluator or for the consultant to become the lawyer. The value comes from putting those perspectives together.

Professional Reputation Is Not the Analysis

. Professional guidance also provides a useful framework for review. The APA Specialty Guidelines for Forensic Psychology direct forensic practitioners to strive for accuracy, impartiality, fairness, and independence. They also emphasize weighing data, opinions, and rival hypotheses impartially and recognizing the effect that personal beliefs or biases may have on professional judgment (American Psychological Association [APA], 2013).

That expectation becomes especially relevant when one professional reviews another professional's work. APA Guideline 11.05 states that disagreements should be expressed professionally and based on a fair examination of the other professional's data, theories, standards, and opinions (APA, 2013).

Meaningful review should not begin with the assumption that the evaluator was wrong. It should not begin with the assumption that the evaluator must be right either. It should begin with the work.

That matters especially in a relatively small professional community, where evaluators often know one another through trainings, professional organizations, committees, consultation, and referral networks. Those relationships are part of professional life and are not inherently problematic, but they can create impressions that precede review of the work itself.

A reviewer who assumes an evaluator must have made mistakes has started with the answer. The same is true of someone who assumes that the work of a respected colleague does not require meaningful scrutiny. Independent review should neither protect nor attack the evaluator. It should examine the information, methodology, limitations, inferences, and conclusions in the case at hand

Consultation Before Rebuttal

Consultation and rebuttal testimony do not have to be competing approaches. Consultation can come first. A consultant can help counsel identify where an evaluation is genuinely vulnerable and which concerns are unlikely to affect the outcome. The review may include comparing important assertions with source records, identifying where the evaluator moved from fact to inference, examining whether competing hypotheses were considered, and assessing whether stated limitations affect the weight of a conclusion.

The consultant can also help counsel anticipate how an evaluator is likely to respond under examination. A question that sounds powerful in preparation may produce an answer that does little to advance the attorney's theory of the case. Another may look deceptively simple but expose an important gap in reasoning.

Good consultation should narrow the challenge when appropriate. If the evaluator considered the relevant information, evaluated reasonable competing explanations, acknowledged significant limitations, and reached a conclusion that is adequately supported, counsel benefits from knowing that before spending significant client resources attempting to undermine it. Consultation should not be used to manufacture disagreement. Its purpose is to help counsel determine what actually deserves scrutiny.

That analysis may confirm that a rebuttal expert is needed. A case may involve sophisticated psychological testing, a technical scientific issue, a complex diagnostic question, or an opinion beyond the evaluator's professional expertise. There may also be circumstances in which the court needs affirmative expert testimony that cannot be developed through examination of the original evaluator. In those situations, another expert may be exactly the right choice.

Available Resources

Cost matters in family court. By the time a custody evaluation is completed, families may already have invested substantial financial and emotional resources. Retaining another expert can mean additional record review, attorney conferences, report preparation, deposition preparation, and trial testimony.

Those expenses may be entirely justified. The question is whether they are necessary to accomplish the objective. McNamara and Lund (2023) describe a field in which expectations for evaluator expertise continue to rise while cost and access remain significant concerns. Their discussion supports thoughtful matching of professional services to the problem that actually needs to be solved.

If the court needs an independent professional opinion on a specialized issue, rebuttal testimony may be appropriate. If counsel first needs to understand where the evaluation is well supported, where the reasoning may be vulnerable, and how to examine the evaluator effectively, consultation may be the more focused initial investment. That approach does not replace legal judgment. It supports it.

Start With the Question the Court Needs Answered

When an unfavorable evaluation arrives, the first question does not necessarily have to be, 'Who can I retain to disagree with this evaluator?' A more useful starting point may be, 'What does the court need to understand about this evaluation?' Then select the professional tool that best answers that question.

Sometimes the answer will be affirmative testimony from another expert. Sometimes it will be the evaluator's own source material, the reasoning reflected in the report, and a carefully constructed examination of how the opinion was reached.

A rebuttal expert can provide the court with another opinion. Consultation can help counsel understand the opinion already before the court well enough to decide whether another one is needed. After years in the witness chair, I have become increasingly interested in that space between receiving an evaluation and deciding how to challenge it. It is often where the most useful questions emerge. Sometimes the difference is not another expert. It is a better question.

References

American Psychological Association. (2013). Specialty guidelines for forensic psychology. American Psychologist, 68(1), 7-19. https://doi.org/10.1037/a0029889

Association of Family and Conciliation Courts. (2022). Guidelines for parenting plan evaluations in family law cases. https://www.afccnet.org/Resource-Center/Practice-Guidelines

McNamara, K., & Lund, M. (2023). The future of parenting plan evaluations: A view from the trenches. Family Court Review, 61(4), 691-702. https://doi.org/10.1111/fcre.12756