Expert Witness Duty to Court
Definition
The overriding obligation of an expert witness in common law proceedings to assist the court impartially, superseding any duty to the retaining party; codified in England and Wales at CPR Part 35.3 and Criminal Procedure Rules Part 19.2.
- UK civil codification
- Civil Procedure Rules Part 35.3
- UK criminal codification
- Criminal Procedure Rules Part 19.2
- Field source
- Forensic psychology expert testimony
- Priority order
- Duty to court overrides duty to the retaining party
Common questions
Why does this duty appear separately in civil and criminal procedure rules in England and Wales?+
Civil and criminal proceedings run under separate procedural codes with different evidentiary standards, so the overriding duty is codified once in each, CPR 35.3 for civil and CrimPR 19.2 for criminal, to make it enforceable within that track's own framework.
Can a forensic psychologist give both a treating-clinician opinion and an expert-witness opinion in the same case?+
It creates a conflict most courts caution against. A treating clinician has a therapeutic relationship with the subject that can compromise the impartiality the expert role requires, so a separate independent expert is often recommended for court opinion.
Related terms
- BSA 2023 Section 39
- The expert-evidence provision of India's Bharatiya Sakshya Adhiniyam 2023, successor to Indian Evidence Act Section 45. Governs the admissibility of expert opinion...
- Contemporaneous Documentation
- The requirement to record assessment observations, raw data, collateral information reviewed, and the reasoning for forensic opinions at the time they are...
- Court-Appointed Expert
- A neutral forensic expert appointed by the court independently of the parties; the default model in French and German civil law systems...
- CPR Part 35
- The Civil Procedure Rules section governing expert evidence in England and Wales. It establishes the expert's overriding duty to the court, the...
- Dual-Role Conflict
- The professional conflict arising when a forensic psychologist simultaneously holds a therapeutic and an evaluative relationship with the same individual; addressed under...
- Federal Rules of Evidence Rule 702
- The US federal rule governing expert testimony, requiring that the opinion be based on sufficient facts, reliable principles, and a reliable application...
- Insanity Defense Reform Act 1984
- US federal legislation passed after the Hinckley acquittal that restricted expert psychiatric and psychological testimony in insanity proceedings by prohibiting direct ultimate-issue...
- Party-Retained Expert
- A forensic psychologist instructed by one party to litigation to provide an expert opinion; subject to the overriding duty to the court...
- R V. Mohan 1994
- Canadian Supreme Court decision establishing a four-factor admissibility test for expert evidence: relevance, necessity, absence of an exclusionary rule, and a properly...
- Ultimate-Issue Rule
- The traditional prohibition on an expert stating an opinion on the very factual question the court must decide, on the ground that...