Mental health expert witnesses

Mental health evidence is used to assess diagnosis, treatment, functional impact and, where relevant, capacity. The opinion remains within the practitioner’s discipline and the material supplied.

Preparing a mental health expert witness instruction

A mental health expert witness should be given a clear, neutral request that identifies the clinical questions, the relevant period and the material on which the opinion is to proceed. In this context, the usual issues may include psychiatric presentation, psychological functioning, treatment, capacity and day-to-day impact. The instruction should distinguish those clinical questions from the factual and legal issues that remain for the court, and should not ask the practitioner to determine disputed facts.

A complete chronology helps the practitioner understand the presentation in context. Depending on the case, the relevant bundle may include primary-care and hospital records, therapy notes, medication history, earlier assessments and occupational or educational material. The expert will decide whether a current assessment, a records review or further information is needed. They should be able to state what the available evidence supports, where the evidence is incomplete and the limits that apply to any retrospective opinion.

Some instructions require more than one discipline. Mental health may sit alongside psychiatry, psychology, neuropsychology or neuropsychiatry, but each practitioner should have a defined remit. Focused questions and a proportionate bundle reduce duplication, assist efficient case management and allow the report to explain its reasoning, functional conclusions and clinical limits in a way the court can evaluate.

Practitioners are listed across the United Kingdom and Republic of Ireland. Scope, documents and availability are agreed directly with the practitioner.