Expert evidence and forensic report writing — structured clinical viva

Roles. Fact/treating witnesses report clinical observations and care. Expert witnesses apply specialised methods to legal questions under an impartiality frame serving the decision-maker. Registrars need coaching to control scope when subpoenaed as treaters.^[1][2]

Dual role. Simultaneous therapist and contested expert roles create conflicts among alliance, confidentiality, and truth-seeking. Prefer independent experts; otherwise disclose, limit, document, or decline. Appelbaum frames forensic ethics around truth-seeking and respect for persons, not pure clinical beneficence alone.^[2][3]

Assessment. Clarify questions; disclose forensic role; gather records; interview/MSE; adjunct tools within competence; formulate; opine criterion-by-criterion. AAPL forensic assessment guideline is the scaffold.^[1]

Report. Questions, sources/gaps, role, history, MSE, data, formulation, mapped opinions, limitations. Certainty tracks data strength. No invented statutes.^[4][5]

Ultimate issue and admissibility. Ultimate-issue practices regulate how far experts may state the final legal conclusion; supply psychiatric data either way. Frye-type general acceptance and Daubert-type reliability factors are teaching frames applied through local evidence rules — do not invent section numbers.^[6][7]

Bias. Inter-expert disagreement and allegiance bias are real; answer with transparent method, not louder certainty.^[8][10]

Testimony. Prepare from report; plain language on direct; concede fair points and avoid waffle on cross.^[9]