You’re staring at an MBE Evidence question about a metallurgist testifying in a products liability case. The answer choices mention “Daubert,” “FRE 702,” and “reliability.” You’ve heard these terms before, but under exam pressure, the distinctions blur. Is the judge supposed to be a gatekeeper? What exactly does that mean? And why does the bar exam love testing this?

Expert testimony trips up more bar examinees than almost any other Evidence topic because it sits at the intersection of procedure, admissibility standards, and judicial discretion. The Daubert standard isn’t just a case name to memorize—it’s the framework federal courts use to determine whether expert testimony is reliable enough to reach a jury. On the MBE, you’ll see it tested through fact patterns involving scientific experts, technical specialists, and even experience-based testimony. Here’s what you need to know to handle these questions with confidence.

What FRE 702 Actually Requires

Before Daubert, you need to understand the rule it interprets. Federal Rule of Evidence 702 governs the admissibility of expert witness testimony. A witness who is qualified as an expert by knowledge, skill, experience, training, or education may testify in the form of an opinion if:

  1. The expert’s scientific, technical, or other specialized knowledge will help the trier of fact understand the evidence or determine a fact in issue
  2. The testimony is based on sufficient facts or data
  3. The testimony is the product of reliable principles and methods
  4. The expert has reliably applied those principles and methods to the facts of the case

Notice what this rule does: it makes the judge a gatekeeper. The jury doesn’t get to hear expert testimony unless the judge first determines it meets these requirements. This is a preliminary question of admissibility under FRE 104(a), which means the judge decides it outside the presence of the jury and isn’t bound by the rules of evidence (except privilege) when making the determination.

On the MBE, watch for questions that ask who decides whether an expert is qualified or whether the methodology is reliable. The answer is always the judge, not the jury.

The Daubert Standard Explained

In Daubert v. Merrell Dow Pharmaceuticals, the Supreme Court interpreted FRE 702 and established that trial judges must act as gatekeepers to ensure expert testimony is both relevant and reliable. The Court rejected the old “general acceptance” test (known as the Frye standard) and gave judges flexibility to assess scientific validity.

The Daubert Court identified several non-exclusive factors judges may consider when evaluating the reliability of scientific expert testimony:

Here’s the critical point for the bar exam: these factors are flexible and non-exhaustive. The judge has discretion. Not every factor applies to every type of expert testimony. A medical expert’s diagnosis based on clinical experience might be evaluated differently than a novel DNA testing method.

Daubert Applies Beyond Hard Science

Many students mistakenly think Daubert only governs scientific experts like chemists or engineers. Wrong. In Kumho Tire Co. v. Carmichael, the Supreme Court extended Daubert’s gatekeeping obligation to all expert testimony, including testimony based on technical or specialized knowledge.

This matters on the MBE because you’ll see questions involving:

The judge must still assess reliability, but the Daubert factors may not fit perfectly. For an expert testifying about tire failure based on 30 years of industry experience, “peer-reviewed publication” might be irrelevant. The judge adapts the inquiry to the nature of the expertise.

Here’s a hypothetical that could appear on the MBE:

In a medical malpractice action, plaintiff calls Dr. Adams, a surgeon with 25 years of experience, to testify that defendant’s surgical technique fell below the standard of care. Dr. Adams bases his opinion on his review of the operative notes and his professional experience, but he has not published any articles on the technique and cannot cite any studies. Defendant moves to exclude the testimony under Daubert. How should the court rule?

The court should deny the motion. Dr. Adams is qualified by experience, his testimony will help the jury understand whether the defendant breached the standard of care, and his methodology (reviewing records and applying clinical judgment) is sufficiently reliable. The lack of publications doesn’t disqualify him—Daubert’s factors are flexible, and experience-based medical testimony routinely satisfies FRE 702.

The Four-Part Test You Must Memorize

While Daubert provides factors for assessing reliability, FRE 702 itself (as amended) gives you a clean four-part test. On the MBE, structure your analysis this way:

First, is the witness qualified as an expert? Look for specialized knowledge, skill, experience, training, or education. The bar is relatively low—you don’t need the world’s foremost authority. A general practitioner can testify about medical causation even if a specialist would be more persuasive.

Second, will the testimony help the trier of fact? This is the helpfulness requirement. Expert testimony is appropriate when it concerns matters beyond the common knowledge of lay jurors. You don’t need an expert to testify that ice is slippery, but you might need one to explain how a particular polymer degrades under heat stress.

Third, is the testimony based on sufficient facts or data? The expert must have an adequate foundation. An engineer who never visited the accident scene and only reviewed a two-page police report probably lacks sufficient data to opine on causation.

Fourth, did the expert reliably apply reliable principles and methods to the facts? This is where Daubert comes in. The methodology must be sound, and the expert must have actually followed it. An expert who uses a peer-reviewed formula but plugs in the wrong numbers fails this prong.

Common MBE Traps Involving Expert Testimony

The bar examiners love certain recurring patterns. Watch for these:

The unqualified expert: The witness has general knowledge but lacks specific expertise in the relevant field. A podiatrist testifying about brain surgery? Not qualified. A civil engineer testifying about structural failure in a bridge collapse? Qualified.

The ipse dixit expert: The expert offers a conclusion without explaining the methodology. “In my opinion, the drug caused the plaintiff’s illness” isn’t enough. The expert must explain the basis—what studies, what differential diagnosis, what principles support the conclusion. An expert’s say-so, standing alone, doesn’t satisfy Daubert.

The litigation-driven methodology: The expert used a method created specifically for the lawsuit that hasn’t been validated outside the courtroom. This raises red flags. If the technique was developed solely to generate an opinion for trial and can’t be tested independently, it likely fails Daubert.

Confusing weight with admissibility: This is huge. Weaknesses in an expert’s opinion generally go to weight, not admissibility. If an expert is qualified and uses a reliable methodology, the fact that opposing counsel can poke holes in the opinion on cross-examination doesn’t make it inadmissible. The question is whether the testimony clears the threshold for admission, not whether it’s bulletproof.

Here’s another MBE-style fact pattern:

In a toxic tort case, plaintiff’s expert, a toxicologist, testifies that exposure to chemical X caused plaintiff’s liver disease. On cross-examination, defendant establishes that the expert has never published on chemical X, that no peer-reviewed studies link chemical X to liver disease in humans, and that the expert’s opinion is based on extrapolation from high-dose animal studies. Defendant moves to strike the testimony. Should the court grant the motion?

Not necessarily. This is a closer call, but the testimony might still be admissible. The expert is qualified, the methodology (extrapolating from animal studies) is used in toxicology, and the testimony helps the jury. The lack of human studies and the extrapolation issues affect the weight of the testimony—they’re fodder for cross-examination and rebuttal experts—but they don’t automatically render the opinion inadmissible under Daubert. The judge has discretion here, but outright exclusion would be an abuse of discretion if the expert can explain a scientifically valid basis for the extrapolation.

When Expert Testimony Is Not Required

Don’t fall for the trap of thinking every technical issue requires an expert. Lay opinion testimony under FRE 701 is permissible when it’s rationally based on the witness’s perception, helpful to the jury, and not based on scientific, technical, or specialized knowledge.

Courts routinely allow lay witnesses to testify about:

If the MBE question involves a witness with personal knowledge offering a common-sense observation, you probably don’t need FRE 702—you need FRE 701. The key distinction: lay opinions must be based on personal perception, while expert opinions are based on specialized knowledge applied to facts the expert may not have personally observed.

Daubert and the Exclusion of Witnesses

One procedural wrinkle that occasionally appears: can an expert be sequestered under FRE 615? Rule 615 requires the court to exclude witnesses at a party’s request so they can’t hear other testimony, but it carves out exceptions for persons whose presence is essential to presenting a claim or defense. Experts often fall into this exception—they may need to hear fact testimony to form or adjust their opinions. Expect the MBE to test whether an expert can be excluded from the courtroom.

The answer: the court has discretion to exempt experts from sequestration if their presence is essential, but it’s not automatic. If the expert has already formed an opinion and doesn’t need to hear live testimony, sequestration might be appropriate.

What to Memorize for Exam Day

When you see an expert testimony question on the MBE, run through this checklist:

  1. Is the witness qualified? (Knowledge, skill, experience, training, or education)
  2. Will the testimony help the jury? (Beyond common knowledge?)
  3. Sufficient facts or data? (Adequate foundation?)
  4. Reliable principles reliably applied? (Daubert factors if relevant)
  5. Is the judge the gatekeeper? (Yes, under FRE 104(a))
  6. Weight vs. admissibility? (Weaknesses usually go to weight)

Remember that Daubert doesn’t require perfection. It requires reliability. The expert’s opinion doesn’t need to be correct—it needs to be based on a methodology that’s scientifically valid and properly applied. Disputes about competing methodologies or conflicting expert opinions are resolved by the jury, not excluded by the judge.

Bringing It All Together

Expert testimony questions test your ability to distinguish between threshold admissibility and credibility challenges. The judge decides if the expert gets to testify. The jury decides how much weight to give that testimony. The Daubert standard is the lens through which judges make the admissibility call, but it’s flexible—not a rigid checklist.

If you’re struggling to keep the Daubert factors, the FRE 702 elements, and the procedural nuances straight, you’re not alone. This is dense material that requires active recall, not passive reading. FlashTables organizes all 109 Evidence rules—including the complete framework for expert testimony, impeachment, hearsay, and every other testable doctrine—into structured two-column tables designed for memorization. Instead of flipping through outlines trying to reconstruct the four-part test for FRE 702, you’d have it laid out clearly alongside related rules like lay opinion testimony and judicial notice.

The bar exam rewards students who can retrieve the rule under pressure and apply it to weird facts. Daubert questions are eminently predictable once you know the framework. Nail down FRE 702’s four requirements, understand that the judge is the gatekeeper, and remember that the Daubert factors are tools, not hoops. Do that, and you’ll spot the right answer even when the fact pattern involves an expert testifying about something you’ve never heard of.