Evidence Code § 801
E1028509
Evidence Code § 801 is a provision of the California Evidence Code that governs the admissibility of expert opinion testimony, specifying when and how experts may base and present their opinions in court.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Evidence Code § 801 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T13239851 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Evidence Code § 801 Context triple: [California Evidence Code, hasSection, Evidence Code § 801]
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A.
Code of Evidence
The Code of Evidence is a comprehensive set of rules governing the admissibility and use of evidence in Connecticut courts.
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B.
Federal Rule of Evidence 807
Federal Rule of Evidence 807 is the “residual” hearsay exception that allows admission of certain trustworthy hearsay statements not covered by other specific exceptions when doing so serves the interests of justice.
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C.
Federal Rule of Evidence 1008
Federal Rule of Evidence 1008 is a U.S. evidentiary rule that allocates to the jury (or factfinder) the responsibility for deciding certain preliminary factual questions about the authenticity and contents of writings, recordings, and photographs when those issues are in dispute.
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D.
Federal Rule of Evidence 1007
Federal Rule of Evidence 1007 is a U.S. evidentiary rule that allows a party to prove the contents of a writing, recording, or photograph through the testimony or written statement of the opposing party without producing the original.
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E.
Georgia Evidence Code
The Georgia Evidence Code is the body of state law that governs what evidence is admissible and how it must be presented in Georgia courts.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Evidence Code § 801 Target entity description: Evidence Code § 801 is a provision of the California Evidence Code that governs the admissibility of expert opinion testimony, specifying when and how experts may base and present their opinions in court.
-
A.
Code of Evidence
The Code of Evidence is a comprehensive set of rules governing the admissibility and use of evidence in Connecticut courts.
-
B.
Federal Rule of Evidence 807
Federal Rule of Evidence 807 is the “residual” hearsay exception that allows admission of certain trustworthy hearsay statements not covered by other specific exceptions when doing so serves the interests of justice.
-
C.
Federal Rule of Evidence 1008
Federal Rule of Evidence 1008 is a U.S. evidentiary rule that allocates to the jury (or factfinder) the responsibility for deciding certain preliminary factual questions about the authenticity and contents of writings, recordings, and photographs when those issues are in dispute.
-
D.
Federal Rule of Evidence 1007
Federal Rule of Evidence 1007 is a U.S. evidentiary rule that allows a party to prove the contents of a writing, recording, or photograph through the testimony or written statement of the opposing party without producing the original.
-
E.
Georgia Evidence Code
The Georgia Evidence Code is the body of state law that governs what evidence is admissible and how it must be presented in Georgia courts.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
rule of evidence
ⓘ
section of the California Evidence Code ⓘ |
| addresses |
foundation for expert testimony
ⓘ
reliability of materials underlying expert opinion ⓘ scope of expert opinion ⓘ |
| appliesIn | California state courts NERFINISHED ⓘ |
| appliesTo |
civil cases
ⓘ
criminal cases ⓘ expert witnesses ⓘ testimony at evidentiary hearings ⓘ testimony at trial ⓘ |
| bindingOn | California trial courts NERFINISHED ⓘ |
| category | expert evidence rule ⓘ |
| citationForm | Cal. Evid. Code § 801 ⓘ |
| codifiedIn | California Evidence Code NERFINISHED ⓘ |
| concerns | expert opinion on matters requiring special knowledge, skill, experience, training, or education ⓘ |
| enables | exclusion of expert testimony lacking proper foundation ⓘ |
| function |
to define when expert opinions are admissible
ⓘ
to restrict speculative or unfounded expert opinions ⓘ |
| governs | admissibility of expert opinion testimony ⓘ |
| influences |
admissibility rulings on other specialized knowledge
ⓘ
admissibility rulings on scientific evidence ⓘ admissibility rulings on technical evidence ⓘ |
| interpretedBy |
California Supreme Court
NERFINISHED
ⓘ
California appellate courts NERFINISHED ⓘ |
| jurisdiction | California NERFINISHED ⓘ |
| languageIncludes | requirement that matter relied on be of a type reasonably relied upon by experts in the particular field ⓘ |
| legalSystem | California law of evidence NERFINISHED ⓘ |
| limits | bases on which an expert may form an opinion ⓘ |
| objective |
to ensure expert testimony is grounded in accepted professional practice
ⓘ
to help factfinders understand complex or technical issues ⓘ |
| partOf |
Division 7 of the California Evidence Code
NERFINISHED
ⓘ
Title 8 of the California Evidence Code NERFINISHED ⓘ |
| purpose | to assist the trier of fact ⓘ |
| relatedTo |
Evidence Code § 720
NERFINISHED
ⓘ
Evidence Code § 802 ⓘ Evidence Code § 803 NERFINISHED ⓘ |
| requires |
expert opinion must be based on matter perceived by or personally known to the expert or made known to the expert
ⓘ
expert opinion must be related to a subject sufficiently beyond common experience ⓘ expert opinion to be based on matter that provides a reasonable basis for the opinion ⓘ matter relied on by expert must be of a type reasonably relied upon by experts in the field ⓘ |
| scope |
opinions based on facts in evidence
ⓘ
opinions based on hypothetical questions ⓘ opinions based on information made known to the expert before or at the hearing ⓘ |
| standard |
expert testimony must assist the trier of fact
ⓘ
subject of expert testimony must be sufficiently beyond common experience ⓘ |
| subjectMatter | opinion testimony and expert testimony ⓘ |
| usedBy |
attorneys challenging expert evidence
ⓘ
attorneys offering expert evidence ⓘ judges ruling on expert testimony ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Evidence Code § 801 Description of subject: Evidence Code § 801 is a provision of the California Evidence Code that governs the admissibility of expert opinion testimony, specifying when and how experts may base and present their opinions in court.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.