Bar Exam (Next Generation) Quiz: Opinions And Expert Testimony
12 questions · exam conditions
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Opinions And Expert TestimonyQuestion 1 of 12

In a federal prosecution for first-degree murder, the defendant raises an insanity defense. The defense calls a forensic psychiatrist who evaluated the defendant. The psychiatrist testifies in detail about the defendant's schizophrenia, including delusions from which the defendant suffered at the time of the killing. Defense counsel then asks: 'Doctor, in your opinion, was the defendant legally insane at the time of the killing?'

The prosecution objects. How should the court rule?

Sustained, because expert testimony about a criminal defendant's mental disease or defect is never admissible in a criminal case.
Overruled, because the psychiatrist may state an opinion on the ultimate issue, including whether the defendant was legally insane at the time of the killing.
Overruled, because the rule restricting expert opinions on a defendant's mental state applies only to experts retained by the prosecution.
Sustained, because an expert may not state an opinion about whether the defendant had a mental state or condition constituting an element of the crime charged or of a defense.
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Bar Exam (Next Generation) Quiz

Bar Exam (Next Generation) Quiz: Opinions And Expert Testimony

Practice Opinions And Expert Testimony in Bar Exam (Next Generation) with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Opinions And Expert Testimony, giving you a quick way to practice the rules, question types, and explanations that matter most for Bar Exam (Next Generation).

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

In a federal prosecution for first-degree murder, the defendant raises an insanity defense. The defense calls a forensic psychiatrist who evaluated the defendant. The psychiatrist testifies in detail about the defendant's schizophrenia, including delusions from which the defendant suffered at the time of the killing. Defense counsel then asks: 'Doctor, in your opinion, was the defendant legally insane at the time of the killing?'

The prosecution objects. How should the court rule?

  1. Sustained, because expert testimony about a criminal defendant's mental disease or defect is never admissible in a criminal case.
  2. Overruled, because the psychiatrist may state an opinion on the ultimate issue, including whether the defendant was legally insane at the time of the killing.
  3. Overruled, because the rule restricting expert opinions on a defendant's mental state applies only to experts retained by the prosecution.
  4. Sustained, because an expert may not state an opinion about whether the defendant had a mental state or condition constituting an element of the crime charged or of a defense. (correct answer)
Explanation: When an expert is asked about a criminal defendant's mental state, focus on FRE 704. The general ultimate-issue rule allows opinion testimony on ultimate issues, but in criminal cases Rule 704(b) bars an expert from stating an opinion about whether the defendant had a mental state or condition constituting an element of the offense or of a defense. Here, the psychiatrist properly described schizophrenia, delusions, and their relationship to the killing. The objectionable question asks whether the defendant was "legally insane"—a legal conclusion, not a medical diagnosis. Because insanity is a defense, and "legally insane" expresses an opinion on the mental condition underlying that defense, the expert cannot answer. The jury must apply the legal standard to the clinical evidence and decide for itself. Thus the objection is sustained. Each distractor misses the point. Claiming expert testimony about mental disease is never admissible in a criminal case is overbroad: clinical descriptions are permissible; only legal-status conclusions are barred. Claiming the expert may state any ultimate issue ignores 704(b's criminal-case exception. Claiming the restriction applies only to prosecution-retained experts is also wrong: it applies equally to defense experts. The proper reason to sustain is the prohibition on expert opinions about whether the defendant had a mental state or condition constituting an element of the crime charged or of a defense. Exam takeaway: when a question uses a legal label like "legally insane" or "malice aforethought," remember that experts may explain the condition, but the jury decides the legal conclusion.

Question 2

In a complex patent infringement case, the district judge, on her own initiative and over the objection of both parties, appoints a retired electrical engineer to serve as an expert witness. The judge directs that the parties share the expert's reasonable fees. The expert investigates, submits a report, and the judge proposes to call him as a witness at trial.

Which of the following statements is most accurate?

  1. The appointment is improper because a court may appoint an expert witness only on the motion of a party.
  2. The appointment is proper, but the jury must not be informed that the witness was appointed by the court.
  3. The appointment is proper, and both parties are entitled to cross-examine the court-appointed expert at trial. (correct answer)
  4. The appointment is proper, but the expert's fees may not be allocated to the parties without their consent.
Explanation: Whenever you see a judge appointing an expert witness, think of Federal Rule of Evidence 706. That rule gives the court independent authority—it does not need a party's motion or consent. Here, the district judge's appointment of the retired electrical engineer is proper, and the judge may order the parties to share the expert's reasonable fees. Under Rule 706, a court-appointed expert is subject to cross-examination by all parties, so the statement that "both parties are entitled to cross-examine the court-appointed expert at trial" is the most accurate. The first distractor, "appointment is improper because a court may appoint an expert only on the motion of a party," is wrong because Rule 706 explicitly permits the court to act on its own initiative. The statement that "the jury must not be informed that the witness was appointed by the court" is also wrong—Rule 706 allows the court, in its discretion, to inform the jury that an expert was court-appointed. Finally, the claim that "the expert's fees may not be allocated to the parties without their consent" misreads Rule 706: in ordinary civil cases, the court directs the parties' proportional payment of the expert's compensation, and the amount is later taxed as costs. For exam purposes, remember the three pillars of FRE 706: court-initiated appointment, cross-examination rights, and court-directed fee allocation. If you see "only on motion," "jury must not know," or "parties must consent to fees," those are traps.

Question 3

After a warehouse fire, the plaintiff's estate sues the manufacturer of an electrical extension cord. The only causation expert offered by the plaintiff is a retired fire marshal. He investigated the fire, found a melted extension cord near the apparent origin, and states that in his 30 years of fire investigation he has 'seen this pattern before' when an electrical short starts a fire. He conducted no testing of the cord, identified no physical sign of arcing, consulted no electrical engineer, and cannot identify any feature of the scene or cord that distinguishes an electrical short from other possible ignition sources. The manufacturer moves to exclude.

How should the court rule on the motion?

  1. Grant the motion, because opinions based on personal experience are not a permissible basis for expert testimony.
  2. Deny the motion, because his 30 years of experience qualifies him as an expert and any weakness in his conclusion goes to weight.
  3. Deny the motion, because expert testimony need not be generally accepted and the reliability factors are not exclusive.
  4. Grant the motion, because the plaintiff has not shown that the fire marshal applied reliable principles and methods to the facts of this case. (correct answer)
Explanation: Whenever you see an expert admissibility question, think Federal Rule of Evidence 702: the witness must be qualified, the testimony must be based on sufficient facts or data, and it must be the product of reliable principles and methods reliably applied. Here, the court should grant the motion because the plaintiff has not shown that the fire marshal applied any reliable methodology to the facts. His conclusion rests on a bare assertion that he has "seen this pattern before" — but he tested nothing, identified no arcing, consulted no engineer, and pointed to no distinguishing feature. That is a ipse dixit opinion, not demonstrated expertise. The choice saying opinions based on personal experience are never permissible is too absolute; experience can be a valid basis if the witness explains how it supports a reliable conclusion. The choice saying his 30 years qualify him and weaknesses go to weight confuses qualification with reliability — the judge must be satisfied the methodology is sound before the jury weighs credibility. The choice saying general acceptance is not required and the reliability factors are nonexclusive states true Daubert principles, but it ignores the actual gap: no reliable principles were applied at all, so the testimony fails even under a flexible standard. Study tip: on evidence questions, separate the three admissibility gates — qualification, sufficiency, and reliability. A witness can be qualified yet still excluded if their methodology is unexplained.

Question 4

In a personal injury action arising from a rear-end collision, the plaintiff's treating physician testifies as an expert that the plaintiff's chronic lower-back pain was caused by the accident. The physician examined the plaintiff once, two years after the accident, and based his causation opinion entirely on the plaintiff's description of the accident and symptoms. He ordered no imaging, reviewed no prior medical records, and consulted no studies on the biomechanics of rear-end collisions.

The defendant moves to exclude the physician's causation opinion. How should the court rule?

  1. Deny the motion, because the physician is qualified as a medical doctor and his testimony would assist the jury.
  2. Deny the motion, because physicians may reasonably rely on a patient's self-report, and the weakness of the basis goes to weight, not admissibility.
  3. Grant the motion, because the opinion is not based on sufficient facts or data and is not the product of a reliable application of medical knowledge to the facts. (correct answer)
  4. Grant the motion, because a treating physician may never testify as an expert for a party whom the physician treated.
Explanation: This question tests expert testimony admissibility under Rule 702 and the Daubert reliability standard. A treating physician is not exempt from that standard; when offering a causation opinion, the physician must show sufficient facts or data and a reliable application of medical knowledge to those facts. Here, the physician examined the plaintiff once, two years after the accident, ordered no imaging, reviewed no prior records, and based causation entirely on the plaintiff's own description—without consulting biomechanics studies about rear-end collisions. That creates an analytical gap between the patient's history and the conclusion that the accident caused chronic pain. The court should grant the motion because the opinion lacks a reliable foundation. Denying the motion simply because the physician is qualified as a medical doctor would confuse credentials with reliability: expertise alone does not make a causation opinion admissible. Similarly, the argument that physicians may rely on patient self-report, with weaknesses going to weight, is too broad. Self-report may support a diagnosis, but here it is the only basis for a remote causation opinion, unsupported by objective evidence or scientific literature, so the deficiency goes to admissibility, not merely weight. Finally, the claim that a treating physician may never testify as an expert for a party he treated is wrong—treating physicians can testify as experts when their testimony meets Rule 702. Remember to separate qualifications, sufficiency of data, and reliability of method. If causation rests only on timing or the doctor's say-so, exclude it.

Question 5

In a products-liability action, the plaintiff's expert, a product-safety engineer, testifies that the defendant's space heater caused the fire. She says her opinion is based on her inspection of the heater and on a federal safety recall notice for that model. The notice is hearsay and is not independently admissible, but the engineer testifies that product-safety engineers reasonably rely on such notices in forming opinions. The defendant moves to exclude the expert's opinion and to prevent the engineer from telling the jury about the recall notice.

How should the court rule on the defendant's motion?

  1. Exclude both, because an expert may not base an opinion on inadmissible hearsay.
  2. Admit the opinion, but permit the notice to be described to the jury only if its value in helping the jury evaluate the opinion substantially outweighs its prejudicial effect. (correct answer)
  3. Admit both, because an expert may rely on inadmissible facts and the jury is entitled to know the basis of the opinion.
  4. Admit the opinion, but exclude any reference to the notice because the notice is hearsay and not independently admissible.
Explanation: Whenever an expert relies on information she did not personally observe, separate two questions: may she rely on it, and may the jury hear about it. Under Federal Rule of Evidence 703, an expert may base an opinion on facts or data that are inadmissible if experts in the field reasonably rely on them. Here, the safety engineer's reliance on the recall notice passes that test, so her opinion should not be excluded just because the notice itself is hearsay. That does not mean the jury automatically hears about the recall notice. Rule 703 places a special guardrail: inadmissible facts underlying an opinion may be disclosed to the jury only if their probative value in helping the jury evaluate the opinion substantially outweighs their prejudicial effect. So the court should admit the opinion and allow the engineer to describe the notice only if that heightened balancing test is satisfied. The first wrong choice, excluding both because an expert may not rely on inadmissible hearsay, misstates the rule—experts routinely rely on inadmissible material. The choice admitting both because the jury is entitled to know the basis also goes too far; the jury is not automatically entitled to hear otherwise inadmissible details. Finally, admitting the opinion but excluding any reference to the notice confuses non-independent admissibility with disclosure; the notice can be described if its evaluative value substantially outweighs prejudice, even though it cannot come in for its truth. On exam day, remember the "rely versus reveal" distinction—reliance is broad, disclosure is narrow.

Question 6

In a federal negligence action arising from a car accident, a police officer with 15 years of accident-reconstruction training testifies for the plaintiff. The officer did not see the accident. After examining the skid marks, the damage to both vehicles, and their final resting positions, he concluded that the defendant's car had been traveling at least 70 miles per hour in a 30-mile-per-hour zone. The plaintiff did not tender the officer as an expert and did not provide the defendant with expert disclosure.

The defendant objects to the officer's testimony about the car's speed. How should the court rule?

  1. Admissible as lay opinion, because the opinion is rationally based on the officer's perception of the physical evidence and would help the jury determine speed.
  2. Inadmissible, because the opinion is based on specialized knowledge and the officer has not been qualified as an expert witness. (correct answer)
  3. Admissible as expert testimony, because the officer's training and experience qualify him to give the opinion even though he was not formally tendered as an expert.
  4. Inadmissible, because the officer's opinion improperly embraces the ultimate issue of whether the defendant was negligent in causing the accident.
Explanation: When you see a question about lay versus expert opinion, keep your focus on Rule 701 and Rule 702: a witness may give lay opinion only if it is based on personal perception, helpful, and not based on scientific, technical, or other specialized knowledge. If the opinion requires specialized training to reach, it is expert testimony and must be disclosed and qualified. The officer's speed estimate comes from examining skid marks, vehicle damage, and final resting positions — physical evidence any juror could view, but the inference to "at least 70 mph" is not ordinary common-knowledge reasoning. It depends on the officer's 15 years of accident-reconstruction training. Under Rule 701(c), that means specialization, so testimony is inadmissible unless he is offered as an expert, properly qualified, and plaintiff provides expert disclosure. He was never tendered as an expert and no disclosure was made; so the court should sustain the objection. The "admissible as lay opinion" choice is tempting because he did perceive the physical evidence and lay opinion may be based on directly perceived facts. But the fatal flaw is that his opinion is not just factual observation — it is an engineering/reconstruction judgment based on specialized knowledge. The "admissible as expert testimony despite not formally tendered" choice also fails: relevant training alone is not enough; awitness must actually be proffered and qualified by the court, and the opponent deserves pre-trial expert disclosure. Finally, the "improperly embraces the ultimate issue" choice misstates the law: Rule 704 expressly permits opinion testimony that embraces an ultimate issue, including speed and negligence, so that is no basis for exclusion. Study tip: Whenever an opinion depends on police training, scientific principles, or technical reconstruction, remember: "Lay opinion = what anyone could infer; expert opinion = what special training lets you infer."

Question 7

In a products liability action for a tire blowout, the plaintiff calls a mechanic who has repaired and inspected tires for 30 years but has no engineering degree and has never conducted laboratory testing. The mechanic proposes to testify that, based on his experience, a tire showing this particular pattern of tread separation was manufactured with a defect, and that the blowout was not caused by underinflation. The defendant challenges the witness's qualifications.

Which of the following is the most accurate statement about the admissibility of the mechanic's testimony?

  1. The testimony is admissible if the court determines that the mechanic's experience provides a sufficient basis for a reliable opinion on the cause of the blowout. (correct answer)
  2. The testimony is inadmissible because the witness lacks formal scientific or engineering training and has never conducted laboratory testing.
  3. The testimony is admissible only if the mechanic's method has been published in a peer-reviewed journal or is generally accepted in the tire industry.
  4. The testimony is admissible because a witness's 30 years of experience automatically satisfies the reliability requirement of FRE 702.
Explanation: Whenever you see an expert-qualification question, remember that FRE 702 is the lens: an expert may be qualified by knowledge, skill, experience, training, or education—not only by degrees. The judge is the gatekeeper and must ensure the opinion is both reliable and based on sufficient facts or data. Here, the mechanic's 30 years of repairing and inspecting tires could qualify him, but only if the court is satisfied that his experiential method provides a reliable basis for his opinion on defect and causation. That is why the correct statement is that the testimony is admissible if the court determines the mechanic's experience provides a sufficient basis for a reliable opinion on the cause of the blowout. The distractor saying the testimony is inadmissible because the witness lacks formal scientific or engineering training and has never conducted laboratory testing is too rigid—experience can suffice under Rule 702. Likewise, the claim that the testimony is admissible only if the mechanic's method has been published in a peer-reviewed journal or is generally accepted in the tire industry overstates the law: peer review and general acceptance are relevant factors, not absolute prerequisites. Finally, the statement that 30 years of experience automatically satisfies the reliability requirement is a trap—experience alone does not guarantee reliability; the court must still evaluate how that experience supports the opinion. Study tip: when an expert relies on experience, ask whether the witness explains a reliable link between that experience and the specific conclusion offered.

Question 8

In a federal prosecution for knowingly receiving stolen property, the defense calls a clinical psychologist who evaluated the defendant. The psychologist is prepared to testify that the defendant has an intellectual disability and that, as a result, 'he did not know the property was stolen.' The government objects to the latter statement.

How should the court rule on the government's objection?

  1. Sustain the objection, because the statement is an expert opinion about whether the defendant had the mental state that is an element of the crime. (correct answer)
  2. Sustain the objection, because an expert may never testify about a criminal defendant's mental state or condition.
  3. Overrule the objection, because expert testimony may embrace an ultimate issue that the jury must decide.
  4. Overrule the objection, because the psychologist may explain the basis for her diagnosis in the form of an opinion.
Explanation: Whenever you see an expert testifying about a criminal defendant's mind, think about Rule 704(b): expert opinion may generally embrace an ultimate issue, but in a criminal case an expert may not state an opinion on whether the defendant had the mental state that is an element of the crime. That exception is the key here. The psychologist may explain the defendant's intellectual disability and its general effects, but saying "he did not know the property was stolen" is a direct opinion that the defendant lacked the knowledge required for the crime. Because knowledge is an element of receiving stolen property, the court should sustain the objection. The choice that says an expert may never testify about a defendant's mental state is too broad—experts may testify about diagnoses, conditions, and behavioral tendencies. The choice saying the objection should be overruled because expert testimony may embrace an ultimate issue forgets that Rule 704(b) creates a specific criminal exception to that general rule. And the choice saying the psychologist may explain the basis for her diagnosis misses the point: explaining a diagnosis is allowed, but it does not permit a direct conclusion about the defendant's actual mental state at the time of the crime. On exam day, when you see an expert opinion about what a defendant "knew" or "intended," immediately think of the mental-state-element prohibition. General ultimate-issue testimony is allowed; this narrow criminal exception is the trap.

Question 9

In a products liability action, the plaintiff's engineering expert testifies that a machine was defectively designed. His opinion is based in part on statements by three former factory employees, whom he interviewed during his investigation, that the machine had malfunctioned repeatedly before the plaintiff's injury. The expert testifies that engineers in his field routinely rely on such employee interviews in evaluating product defects. The former employees will not testify at trial. When the expert begins describing the content of the employees' statements to the jury, the defendant objects.

How should the court rule on the objection?

  1. Sustained, because the content of the otherwise inadmissible statements may be disclosed to the jury only if their probative value substantially outweighs the danger of unfair prejudice. (correct answer)
  2. Sustained, because the expert's opinion is inadmissible if it is based on hearsay statements that are not independently admissible.
  3. Overruled, because an expert may rely on inadmissible facts or data and may fully describe them to the jury to explain the basis of the opinion.
  4. Overruled, because the employees' statements are admissible as statements against interest, since the statements could expose the employees to civil liability.
Explanation: When an expert relies on inadmissible facts or data, the Federal Rules draw a sharp line between reliance and disclosure. Under Rule 703, an expert may base an opinion on hearsay if it is the type reasonably relied upon by experts in the field—so the opinion itself is not defective. However, the 2000 amendment restricts what the expert can tell the jury about that underlying data. The expert may only reveal the otherwise inadmissible facts to the jury if their probative value substantially outweighs the danger of unfair prejudice. Here, the interviews are exactly the kind of data engineers rely on, so the opinion is valid. But because the employees will not testify, letting the expert describe their statements to the jury would expose them to hearsay without cross-examination. The court should sustain the objection because that high "substantially outweighs" threshold is not met. Why the others fail? The answer claiming the opinion is inadmissible simply because it rests on hearsay misstates Rule 703—experts may rely on such material. The answer suggesting the expert may fully describe the statements is the classic trap; reliance is allowed, but disclosure is not automatic. Finally, the answer treating the statements as admissible statements against interest is flawed because the employees' observations about malfunctioning don't necessarily expose them to civil liability, and the real issue is the expert's disclosure, not the statements' independent admissibility. On the bar, whenever an expert relies on hearsay, ask two questions: Can they rely on it? (Yes, if reasonably relied upon.) Can they tell the jury the details? (Only if probative value substantially outweighs prejudice.) That second question is the one being tested here.

Question 10

In a toxic tort action, the plaintiff claims that exposure to a chemical solvent at work caused his rare form of leukemia. The plaintiff's expert, a board-certified oncologist, testifies that the solvent caused the leukemia. The opinion is based solely on the timing of the exposure and the onset of the illness and on the doctor's general clinical experience. The doctor identifies no epidemiological studies, animal studies, or other scientific literature showing that the solvent can cause this type of leukemia. The defendant moves to exclude.

How should the court rule?

  1. Deny the motion, because doubts about the factual basis of an expert's opinion go to weight, not admissibility, and the witness is a qualified physician.
  2. Grant the motion, because the opinion is not based on sufficient facts or data and there is too great an analytical gap between the data and the causation conclusion. (correct answer)
  3. Deny the motion, because a reliable expert methodology need not be generally accepted in the scientific community to be admissible.
  4. Grant the motion, because the expert's methodology has not been generally accepted by the relevant scientific community.
Explanation: Whenever you see a question about expert testimony in a toxic tort case, your mind should jump to the trial judge's gatekeeping role under Daubert and FRE 702. The key isn't just whether the witness is qualified, but whether the opinion is reliable and based on sufficient facts or data. Here, the oncologist's opinion rests solely on timing and general clinical experience, with no epidemiological studies, animal studies, or literature to support the causal link. This creates too great an analytical gap between the data (timing) and the conclusion (specific causation). The court should grant the motion to exclude because the opinion is not based on sufficient facts or data, and there is no scientific bridge connecting them. The choice saying "doubts about the factual basis of an expert's opinion go to weight, not admissibility" is a tempting trap. That rule applies to minor factual disputes, but it does not save an opinion that lacks any foundational scientific support—that is an admissibility issue, not a weight issue. The choice stating "a reliable expert methodology need not be generally accepted" is technically true under Daubert, which rejected the Frye standard, but the problem here is that the methodology is not reliable in the first place; anecdotal experience alone is insufficient. Finally, the choice arguing the motion should be granted because the "methodology has not been generally accepted" invokes the outdated Frye test. The flaw is the analytical gap, not a lack of community consensus. Your study tip: when an expert's causation opinion is based only on temporal proximity and personal experience, without any corroborating science, flag it as a classic Daubert exclusion for an analytical gap.

Question 11

In a federal diversity action, the plaintiff claims that occupational exposure to the solvent trichloroethylene (TCE) caused her multiple sclerosis (MS). The plaintiff's only causation expert, Dr. A, is a board-certified neurologist. He intends to testify that TCE can cause MS and that, more likely than not, TCE caused this plaintiff's MS. In support, he cites peer-reviewed animal studies showing TCE produces demyelination and a peer-reviewed epidemiological study of TCE-exposed workers showing a statistically significant doubled risk of MS. Dr. A did not perform a dose reconstruction for the plaintiff's exposure; he assumed the exposure was sufficient. He also acknowledged that the plaintiff's mother and sister have MS and that the plaintiff had a prior Epstein-Barr virus infection, but he made no attempt to account for either risk factor in reaching his specific-causation conclusion. The defendant moves to exclude Dr. A's testimony in its entirety.

How should the court rule on the defendant's motion to exclude Dr. A's testimony in its entirety?

  1. Deny the motion in full. Once a witness is shown to be qualified, any challenge to the data or methodology used goes only to the weight of the testimony, not to its admissibility.
  2. Grant the motion in full. Because no controlled human experiments establish that TCE causes MS, the expert's opinion lacks sufficient facts or data and must be excluded.
  3. Admit in part and exclude in part: admit the testimony that TCE can cause MS, but exclude the testimony that TCE more likely than not caused this plaintiff's MS because that specific-causation conclusion is not reliably connected to the evidence. (correct answer)
  4. Grant the motion in full. Because the expert failed to rule out the plaintiff's family history and prior Epstein-Barr infection as alternative causes, his entire causation opinion is unreliable.
Explanation: When you see a Daubert challenge to expert causation testimony, separate general causation ("can it cause this disease?") from specific causation ("did it cause this plaintiff's disease?"). The court must evaluate each step of the expert's reasoning, not just the expert's credentials. Here, Dr. A's general-causation opinion is adequately grounded: peer-reviewed animal studies and an epidemiological study showing a doubled MS risk provide sufficient facts and data to support a reliable conclusion that TCE can cause MS. So excluding his testimony entirely is too harsh. His specific-causation opinion, however, is not reliably connected to the evidence. He assumed sufficient exposure without doing a dose reconstruction, and he ignored the plaintiff's family history of MS and prior Epstein-Barr infection—both recognized risk factors—without explaining why TCE, rather than those factors, was more likely than not the cause. That analytical gap makes the "more likely than not" conclusion unreliable, so that portion should be excluded. The choice saying a qualified witness's methodology can only be attacked on weight is wrong: Daubert requires the court to screen methodology and reliability. The choice demanding controlled human experiments is also wrong—animal and epidemiological evidence can be sufficient. And the choice excluding the entire opinion because he failed to rule out alternatives goes too far; that failure undermines specific causation, not the general causation testimony. On exam day, always ask: is the challenge to the general link, the individual link, or both? That will guide the partial-admit/partial-exclude result.

Question 12

In a medical malpractice action, the plaintiff's expert testifies on direct examination that a particular surgical technique is the accepted standard of care. On cross-examination, the defendant's attorney asks the expert about a statement in a leading surgical textbook that criticizes the technique. The expert admits the textbook is a reliable authority but says he disagrees with the statement. The defendant's attorney then reads the statement to the jury and offers the textbook itself into evidence.

Under the Federal Rules of Evidence, how should the court rule on the offer of the textbook as an exhibit?

  1. Admit the textbook as an exhibit, because it is a reliable authority and the statement is relevant to the standard of care.
  2. Exclude the textbook as an exhibit, because statements from learned treatises may be read into evidence but not received as exhibits. (correct answer)
  3. Admit the textbook as an exhibit, but only for the limited purpose of impeaching the plaintiff's expert witness.
  4. Exclude the textbook as an exhibit, because the expert disagreed with the statement contained in the textbook.
Explanation: Whenever you see a learned-treatise question, recall the key distinction: Federal Rule of Evidence 803(18) lets you use a reliable treatise to question an expert, but the statement may only be read into evidence—the treatise itself is not received as an exhibit. Here, the plaintiff's expert admitted the textbook was a reliable authority, and the defendant read the critical statement aloud. That is exactly what the rule permits. However, the defendant then offered the book itself as an exhibit, and the rule forbids that. The jury may hear the statement as substantive evidence of the standard of care, but the textbook cannot go back to the jury room. The choice saying "admit the textbook as an exhibit, because it is a reliable authority and the statement is relevant" confuses the reliability of the source with the exhibit limitation. The choice saying "admit ... only for the limited purpose of impeaching the plaintiff's expert" also fails: 803(18) is not an impeachment-only rule, and even if it were, the exhibit still could not be admitted. The choice saying "exclude ... because the expert disagreed" misreads the rule—an expert's disagreement is precisely when a treatise may be used to challenge or inform the expert; disagreement does not make the statement inadmissible. Remember the takeaway: with learned treatises, "read it, don't file it." The statement comes in, the book does not.