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Applying the Rules of Evidence to Expert Testimony About Risk
1Vanderbilt University, Nashville, Tennessee, USA.
Behavioral Sciences & the Law
|May 16, 2026
Summary
Expert risk assessments in legal settings must be material, probative, helpful, and non-prejudicial. This ensures accurate and fair decision-making in criminal proceedings and commitment hearings.
Area of Science:
- Forensic Psychology
- Legal Psychology
- Evidence Law
Background:
- Expert risk assessments are frequently used in legal contexts, including sentencing and commitment proceedings.
- The admissibility and utility of this expert opinion evidence are critical for judicial decision-making.
Purpose of the Study:
- To establish criteria for the acceptable use of expert opinion evidence regarding dangerousness or risk in legal proceedings.
- To outline the essential qualities that expert risk evidence must possess to be both reliable and admissible.
Main Methods:
- The article presents a conceptual argument based on established principles of evidence and legal procedure.
- It analyzes the characteristics of expert evidence required for effective use in judicial settings.
Main Results:
- Expert risk evidence must meet four key criteria: materiality, probity, helpfulness, and non-prejudicial presentation.
- Materiality requires logical relevance, empirical generalizability, and epistemological relevance.
- Probity relates to accuracy, enhanced by expert testimony, and helpfulness through incremental validity.
Conclusions:
- Adherence to these four criteria ensures that expert risk assessments contribute meaningfully and accurately to legal determinations.
- Properly presented expert evidence can enhance judicial fact-finding while minimizing the risk of misuse or misinterpretation.
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