Under which circumstance may a witness offer opinions based on common experience and first-hand knowledge?

Under which circumstance may a witness offer opinions based on common experience and first-hand knowledge?

• A. Only if they are an expert
• B. Never
• C. When based on common experience of a regular person and have first-hand knowledge
• D. When the question asks for speculation

Answer: (C)

In lay opinion testimony, a witness who is not an expert may offer opinions if they are rationally based on the witness’s own perceptions and will help the trier of fact understand the evidence. Those opinions must come from the witness’s common experience as a regular person and from first-hand knowledge of what they observed. That’s why this option is best: it fits the rule that ordinary witnesses can share reasonable, perception-based opinions without needing special training. This also clarifies why the other ideas don’t fit. An expert is not required for such opinions, so restricting to experts is too narrow. Statements based on speculation aren’t allowed, because lay opinions must come from actual perception, not guesswork. And while a witness can offer perception-based conclusions, broad legal conclusions like “negligence” go beyond what a lay observer is permitted to provide.

In lay opinion testimony, a witness who is not an expert may offer opinions if they are rationally based on the witness’s own perceptions and will help the trier of fact understand the evidence. Those opinions must come from the witness’s common experience as a regular person and from first-hand knowledge of what they observed. That’s why this option is best: it fits the rule that ordinary witnesses can share reasonable, perception-based opinions without needing special training.

This also clarifies why the other ideas don’t fit. An expert is not required for such opinions, so restricting to experts is too narrow. Statements based on speculation aren’t allowed, because lay opinions must come from actual perception, not guesswork. And while a witness can offer perception-based conclusions, broad legal conclusions like “negligence” go beyond what a lay observer is permitted to provide.