ETC Courtroom Testimony & Legal Procedures Flashcards

What is the legal difference between a fact witness and an expert witness in court?

Answer: A fact witness testifies about direct observations; an expert witness gives opinions based on specialized knowledge beyond common understanding

Fact witnesses testify only to what they personally observed, while expert witnesses are qualified by the court to offer opinions and interpretations based on specialized knowledge.

What is the 'best evidence rule' as it applies to documentary and photographic evidence?

Answer: The original document or photograph should be produced in court rather than a copy, unless the original is unavailable

The best evidence rule (Federal Rule of Evidence 1002) requires production of original documents or recordings to prove their content, unless the original is lost, destroyed, or otherwise unavailable.

How does a defense attorney's cross-examination typically challenge evidence technician testimony?

Answer: By questioning collection procedures, chain of custody gaps, potential contamination, and the technician's training and qualifications

Defense cross-examination targets weaknesses in collection methods, breaks in chain of custody, potential contamination, and whether the technician followed proper protocols.

What is voir dire in the context of an expert witness qualification?

Answer: A preliminary questioning by the court and attorneys to determine whether a witness qualifies as an expert

Voir dire in expert witness qualification is a preliminary examination where both sides question a proposed expert to determine if they possess the necessary specialized knowledge to offer opinions.

What is required for physical evidence to be authenticated before it is admitted in court?

Answer: Sufficient evidence that the item is what it is claimed to be, typically established through chain of custody and witness identification

Authentication requires presenting sufficient evidence that the item is what the proponent claims; chain of custody records and testimony from the collecting officer typically satisfy this requirement.

An evidence technician discovers a mistake in their chain of custody documentation before trial. What is the appropriate action?

Answer: Immediately notify the supervising officer and prosecutor, document the error and correction, and be prepared to explain it in testimony

Transparency is essential; immediately reporting and documenting chain of custody errors to supervisors and prosecutors allows the issue to be addressed openly rather than discovered and exploited during trial.