Lay Opinion Testimony

Lay opinions must be rationally based on perception and helpful to understanding the testimony.

Related Witnesses & Opinions rules

• Expert Testimony StandardExpert testimony is admissible when the witness is qualified and the testimony is reliable and helpful.
• Judicial Control of WitnessesCourts may control mode and order of interrogation to make procedures effective and avoid harassment.
• Refreshing RecollectionA witness may refresh memory with any item, but opposing party may inspect and cross-examine on it.

Part of Evidence on Core Legal Rules — foundational MBE-tested principles with primary-source citations.