Expert reports and court evidence in child protection — formative SAQs

SAQ 1 — Roles, the report structure and the standard of proof (10 marks)

You are a general paediatrician. You treated a 7-month-old infant admitted with a femur fracture and multiple healing posterior rib fractures found on skeletal survey. Three months later you receive a letter of instruction from a legal representative asking you to prepare an expert report for family-protection proceedings addressing the likely causation of the injuries. ^{[2] [6]}

Questions

1. Distinguish your role as the treating clinician (witness of fact) from your role if instructed as an expert witness, and explain why the distinction matters. (3 marks) ^[2]
2. Outline the structure your expert report should follow. (4 marks) ^{[2] [1]}
3. State the standard of proof at which your opinion should be expressed in a family-protection proceeding, and explain why you should not use the phrase "beyond reasonable doubt." (3 marks) ^[3]

Model answer

Roles and why they matter (3). As the treating clinician you are, in the first instance, a witness of fact: you give a factual account of what you observed, examined and did — the history as given, the examination findings, the investigations ordered and the treatment provided. A witness of fact generally does not offer opinion evidence. If separately instructed as an expert witness, you are asked to provide opinion evidence beyond fact — interpretation of the injury pattern, causation, mechanism, and the weighing of the differential. The distinction matters because opinion evidence is admissible only from a properly qualified expert and carries a different evidentiary weight; conflating the roles (offering opinion as a witness of fact, or confining yourself to fact when asked for expert opinion) confuses the court and weakens the evidence. You must declare which role you occupy. In both, your overriding duty runs to the court, not to the party instructing you. ^{[2] [6]}

Report structure (4). A defensible expert report follows a consistent architecture: the instruction (who asked you and the precise questions you are addressing); the material reviewed (medical records, imaging, laboratory results, prior reports, statements); the background and history; the findings (documented with reference to the contemporaneous record, body map and photographs); the differential diagnosis and its weighing (what the findings show and what they exclude); the opinion, with the reasoning chain that supports it; the limits and residual uncertainty stated honestly; the conclusion; and your curriculum vitae attached to establish your expertise. The opinion is expressed at the correct standard of proof, sources are cited, and the report complies with the applicable expert code of conduct. ^{[1] [2]}

Standard of proof (3). In a family-protection (civil) proceeding, the standard of proof is the balance of probabilities — more likely than not. Your opinion should be expressed at that threshold. You should not use "beyond reasonable doubt" because that is the criminal standard and the court's task, not the medical expert's; borrowing it overstates the certainty a medical opinion can bear and invites the opposing party to argue your opinion cannot be relied upon. Dias and colleagues showed that "reasonable medical certainty" itself lacks a stable shared meaning among medical experts, so the disciplined approach is to express certainty in the terms the specific proceeding requires, and to acknowledge residual uncertainty rather than inflate it. ^[3]