Ultimate Issue
Definition
The central question the court must decide: guilty or not guilty, liable or not liable. Traditionally experts were prohibited from expressing opinions on the ultimate issue, on the theory that this usurps the fact-finder's role. Most jurisdictions have relaxed this rule but experts should still frame opinions carefully to avoid appearing to direct the verdict.
- Definition
- The core question the court must decide
- Historical rule
- Experts prohibited from opining on it
- Modern trend
- Most jurisdictions have relaxed the prohibition
- Practical guidance
- Experts still frame opinions carefully
Common questions
Why did courts originally bar experts from addressing the ultimate issue?+
The rule rested on the theory that an expert opinion stated as directly as 'the defendant is guilty' would usurp the jury's exclusive role as fact-finder, effectively substituting the witness's judgment for the jury's own deliberation.
If the rule has relaxed, why do experts still avoid direct ultimate-issue language?+
Even where the rule permits it, phrasing an opinion as a direct verdict risks the jury simply deferring to the expert rather than weighing the underlying evidence, so cautious experts frame conclusions in terms of what the evidence supports rather than declaring guilt or liability outright.
Related terms
- Concurrent Evidence
- Also called 'hot-tubbing': a procedure, common in Australian courts and used experimentally in England, where opposing experts give evidence simultaneously, respond to...
- 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...
- 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...
- Expert Witness
- A person whose specialised knowledge is accepted by a court and who gives opinion evidence, not just factual evidence. Forensic auditors frequently...
- Overriding Duty to the Court
- The principle in English and Welsh law, codified in the Criminal Procedure Rules and the Civil Procedure Rules, that an expert witness...