What is lay witness opinion under Rule 701, and when is it permissible?

• A. Lay witnesses may offer opinions based on their perception that are helpful to understanding their testimony, provided they are rationally based on perception and not based on specialized knowledge.
• B. Lay witnesses may offer opinions about conclusions that require specialized training.
• C. Lay witnesses may offer any opinion, regardless of perception or knowledge.
• D. Lay witnesses may offer opinions only if the witness is an expert.

Answer: (A)

Under Rule 701, a lay witness can offer an opinion if it comes from the witness’s own perception and helps the jury understand the testimony or decide a fact in issue. The key is that the opinion must be rationally based on what the witness actually perceived through their senses, and it cannot rely on specialized knowledge or expertise.

That’s why this option is the best: it captures both requirements—the opinion must be rooted in the witness’s perception and it must be helpful to the fact-finder. It also correctly excludes opinions that would require specialized training, which would fall under expert testimony (Rule 702). It also rules out the idea that a lay witness may say any opinion or that only an expert may testify.

Think of permissible lay opinions as things a non-expert observer could reasonably infer from what they saw or heard—like noting someone appeared nervous, the car was speeding, or a witness seemed intoxicated based on smell or behavior. These kinds of conclusions are allowed because they are rationally based on perception and assist the jury, not because they rest on technical or specialized knowledge.