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首页/法律术语表/Witness

Witness

/ˈwɪtnəs/
法庭法律依据: Federal Rules of Evidence, Rules 601-615 (Witnesses)

定义

A witness is any person who testifies under oath in court proceedings, providing factual testimony based on personal knowledge. Lay witnesses may only testify about matters they perceived firsthand, unlike expert witnesses who may offer opinions. Witnesses are subject to direct examination by the calling party and cross-examination by the opposing party.

在法庭中

Witnesses testify from the witness stand adjacent to the judge's bench, facing the jury and attorneys. Before testifying, each witness takes an oath or affirmation to tell the truth. On direct examination, the calling attorney asks open-ended questions to elicit the witness's narrative. On cross-examination, opposing counsel may use leading questions to challenge credibility, expose bias, or highlight inconsistencies. The judge may exclude witnesses from the courtroom under the Rule of Sequestration (Rule 615) to prevent them from tailoring testimony based on others' statements.

示例

1

Attorney: "Please state your name and tell the jury what you observed on the evening of January 12th."

2

Attorney: "Isn't it true that you were over 100 feet away and it was dark when you claim to have seen the defendant?"

3

Judge: "The witness may step down. Thank you for your testimony."

常见误解

Students frequently confuse the scope of lay witness testimony. Under FRE 701, lay witnesses cannot offer opinions unless rationally based on their perception and helpful to the jury, such as estimating speed or identifying a voice.

里程碑案例

Crawford v. Washington(2004)

Crawford v. Washington, 541 U.S. 36 (2004)

Held that testimonial hearsay is inadmissible unless the declarant is unavailable and the defendant had prior opportunity to cross-examine.

Chambers v. Mississippi(1973)

Chambers v. Mississippi, 410 U.S. 284 (1973)

Held that evidentiary rules cannot be applied mechanistically to defeat a defendant's right to present witnesses.

Davis v. Alaska(1974)

Davis v. Alaska, 415 U.S. 308 (1974)

Held that the Confrontation Clause prevails over a state's interest in protecting juvenile records, guaranteeing the right to cross-examine about bias.

Lay Witness vs Expert Witness

Lay WitnessExpert Witness
Testifies about personally observed factsTestifies based on specialized knowledge
Opinions limited to rational perceptions (Rule 701)May offer opinions beyond common knowledge (Rule 702)
No qualification process requiredMust be qualified by the court
Cannot rely on inadmissible hearsayMay rely on facts not in evidence if experts in the field rely on them
No Daubert reliability screeningSubject to Daubert/Rule 702 gatekeeping

常见问题

What protections exist for witnesses who fear retaliation?

Federal and state witness protection programs provide relocation and identity changes. 18 U.S.C. section 1512 criminalizes witness tampering. Courts may issue protective orders limiting disclosure of witness identities.

How is a witness impeached during cross-examination?

Through prior inconsistent statements, bias or motive, sensory deficiencies, character for untruthfulness, prior felony convictions (Rule 609), or contradiction by other evidence.

What is the difference between a hostile witness and a friendly witness?

A hostile (adverse) witness allows the calling party to use leading questions under Rule 611(c). A friendly witness is cooperative and examined through open-ended questions on direct.

相关术语

Expert Witness

法庭

An expert witness is a person qualified by knowledge, skill, experience, training, or education to p...

Hearsay Objection

异议

A hearsay objection challenges the admission of an out-of-court statement offered to prove the truth...

Leading Question

异议

A leading question is one that suggests the desired answer within the question itself, typically ans...

Lack of Foundation

异议

A lack of foundation objection is raised when testimony or evidence is offered without first establi...

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