Expert's Duty to the Court
Definition
The overriding obligation, recognised in common law and many civil law systems, that the expert's evidence must be honest, independent, and complete, regardless of who engaged and is paying them. The duty is owed to the tribunal, not the instructing party.
- Nature
- Overriding obligation
- Owed to
- The tribunal, not the instructing party
- Requires
- Honest, independent, and complete evidence
- Recognition
- Common law and many civil law systems
Common questions
How does this duty differ from the party-specific expert witness duty?+
They describe the same underlying principle from two angles: expert witness duty focuses on the procedural obligation codified in rules like CPR Part 35, while the expert's duty to the court is the broader ethical basis that those rules give legal effect to.
What happens when an expert's opinion changes after further review?+
The duty to the court requires the expert to disclose the change and its reasons promptly, rather than staying silent to protect the instructing party's case, since concealment would breach the obligation of completeness.
Related terms
- Authentication (FRE 901)
- The US requirement that a party offering evidence produce sufficient proof to support a finding that the item is what they claim....
- Cross-Examination
- Questioning of a witness by the opposing party. For an expert, cross-examination probes qualifications, methodology, the basis of opinions, limitations, inconsistencies with...
- CSI Effect
- The tendency of jurors, shaped by television forensic dramas, to have unrealistic expectations of forensic evidence quality and to either over-weight clear...
- Daubert Gatekeeping
- The judicial function under Daubert v. Merrell Dow Pharmaceuticals (1993) and Federal Rules of Evidence Rule 702, requiring the trial judge to...
- Daubert Standard
- The US federal evidentiary standard (Daubert v. Merrell Dow Pharmaceuticals, 1993) requiring that expert testimony be based on scientifically valid methods with...
- Examination-in-Chief
- The questioning of a witness by the party who called them. For an expert, this is typically limited because the substance is...
- Frye Standard
- The US legal test for admissibility of scientific evidence, originating from Frye v. United States (1923), which required that a technique be...
- Likelihood Ratio
- A statistical expression of the strength of evidence: how much more probable the observed findings are if the prosecution's hypothesis is true...
- PACE Section 78
- Police and Criminal Evidence Act 1984, section 78: UK courts may exclude prosecution evidence whose admission would adversely affect the fairness of...
- Pre-Trial Conference
- A meeting between the forensic expert and instructing counsel held before the hearing to agree on scope, clarify limitations, identify likely challenges,...
Explained in these topics
- Multimedia Evidence: Admissibility and Expert TestimonyIn most adversarial jurisdictions, an expert witness's primary duty is to the court, not to the party that retained them. This means disclosing limitations, ac...
- Preparing to Testify as a Forensic Expert