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Lay vs Expert Witness Opinion Rules Under FRE 701-702

These flashcards cover the line between lay opinion testimony (FRE 701) and expert witness testimony (FRE 702), a distinction tested heavily on the Multistate Bar Exam and in evidence courses. Lay witnesses may only offer opinions rationally based on personal perception; experts may testify about specialized knowledge if it reliably assists the trier of fact. Confusing the two standards — especially on reliability and foundation requirements — is a frequent source of error for bar exam takers.

Interactive Deck

5 Cards
1
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What are the three requirements for lay opinion under FRE 701?

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  • Rationally based on the witness's own perception
  • Helpful to clearly understanding the testimony or determining a fact in issue
  • Not based on scientific, technical, or other specialized knowledge (to prevent circumventing FRE 702)
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What is the Daubert standard for expert testimony under FRE 702?

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Daubert standard: The trial judge acts as a gatekeeper and must find: (1) the expert is qualified, (2) testimony is based on sufficient facts/data, (3) the opinion uses reliable principles and methods, and (4) the expert reliably applied those methods to the facts. From Daubert v. Merrell Dow Pharmaceuticals (1993).

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What are examples of permissible lay opinion testimony?

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Under FRE 701, lay witnesses may opine on:

  • Speed of a moving vehicle
  • Whether someone appeared intoxicated
  • Handwriting recognition from familiarity
  • Sanity of a person they know well

The opinion must stem from first-hand perception, not specialized expertise.

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What distinguishes lay opinion from expert opinion on the same topic?

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When must a witness be formally qualified as an expert under FRE 702?

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Frequently Asked Questions

What is the difference between FRE 701 and FRE 702?

FRE 701 governs lay witness opinions — limited to perceptions rationally based on first-hand experience and not derived from specialized knowledge. FRE 702 governs expert testimony — requires the witness be qualified and that the opinion rest on reliable principles, sufficient data, and proper application of method. The key distinction is whether the opinion demands specialized knowledge.

Does a lay witness need to be qualified before giving an opinion?

No. Lay witnesses do not need formal qualification under FRE 701 — their testimony is limited by personal perception, not credentialed expertise. Expert witnesses under FRE 702, by contrast, must be recognized as qualified by the court before offering opinion testimony.

How does the 2000 amendment to FRE 701 prevent circumvention of FRE 702?

The 2000 amendment added the requirement that lay opinion not be based on scientific, technical, or other specialized knowledge. This prevents parties from offering expert-caliber opinions through lay witnesses to avoid the more demanding reliability requirements of FRE 702 and the Daubert gatekeeping standard.

Is the Daubert standard used in all courts?

No. Federal courts follow Daubert (1993) as codified in FRE 702. Some state courts still follow the older Frye standard, which asks only whether the scientific methodology is generally accepted in the relevant field. Bar exam takers should assume federal Daubert unless the question specifies a state standard.