Joint Expert Reports Must Identify the Designated Expert’s Own Opinions and Analysis

1. Introduction

In Cain v. State Farm, the Fifth Circuit considered whether homeowners could establish their insurance claims through jointly authored expert reports that did not identify the opinions and analysis attributable to their sole designated expert. The court upheld exclusion of those reports and affirmed summary judgment for the insurer.

The central lesson is not that experts may never collaborate. Rather, collaboration must preserve the ability to identify and evaluate the designated witness’s own opinions, work, and reasoning. A statement that two authors contributed to, reviewed, and agreed with a report did not establish that foundation here—particularly because only one author had been designated as an expert.

The decision also illustrates the consequences of losing essential expert evidence. Without admissible testimony connecting the disputed property damage to a covered event and supporting the additional compensation sought, the homeowners’ contract claim failed. Their associated bad-faith and other asserted extra-contractual claims did not survive independently.

2. Background and Procedural History

The insurance dispute

On August 27, 2022, a tree fell on Dustin and Amanda Cain’s home. Their insurer, State Farm Fire and Casualty Company, concluded that the impact punctured the roof but attributed other damage to long-term thermal movement, deferred maintenance, and settlement—causes it regarded as outside the policy’s coverage.

State Farm initially paid $10,042.90. The Cains subsequently obtained an engineer’s report and a contractor’s estimate asserting that the tree damaged the home, swimming pool, and concrete, with repair costs of $95,896.07. After reviewing its earlier inspection and conducting another inspection, State Farm revised its estimate and paid an additional $3,130.08, while maintaining that the tree had damaged only the roof.

The Cains sued on June 6, 2024, claiming $134,994.54 and asserting breach of contract, breach of good faith and fair dealing, and related demands for consequential damages, attorney’s fees, costs, and interest.

The expert-disclosure problem

In opposing State Farm’s motions, the Cains first requested permission to submit the estimate late, explaining that their lawyer had experienced a medical condition requiring surgery and treatment between December 2024 and March 2025.

After judgment, they sought alteration or amendment, reconsideration, additional time to designate experts, and dismissal without prejudice. The district court denied those requests, finding no intervening change in controlling law, newly discovered evidence, or manifest error. The Cains appealed both the judgment and the post-judgment ruling.

3. Summary of the Opinion

The Fifth Circuit affirmed on four principal grounds:

1. The expert reports were properly excluded. They did not distinguish Fee’s opinions and analysis from Irmiter’s. Their shared endorsement of the reports did not establish what work Fee performed or the basis for his conclusions.
2. The defect concerned admissibility, not merely evidentiary weight. Cross-examination cannot replace the threshold showing necessary to admit expert testimony.
3. Summary judgment followed from the absence of essential proof. The disputed causes of the property damage required specialized knowledge, and the Cains conceded that without the estimate and Fee’s testimony they could not prove their claimed damages.
4. The remaining claims and post-judgment requests did not rescue the action. The court rejected the asserted independent survival of the extra-contractual claims and found no demonstrated basis for post-judgment relief.

The panel expressly declined to decide whether the March estimate was properly excluded as untimely or whether Fee’s proposed testimony independently satisfied Daubert reliability requirements. The attribution defect alone supported affirmance.

4. Legal Reasoning

A. Expert collaboration must remain individually accountable

The court began with Federal Rule of Civil Procedure 26(a)(2)(B)(i), which requires an applicable expert report to contain “a complete statement of all the opinions the witness will express and the basis and reasons for them.” The focus is the particular witness who will testify—not merely the collective conclusions of a consulting firm.

Federal Rule of Evidence 703 allows an expert to rely on facts or data supplied by others. That permission, however, does not allow the expert to serve simply as a conduit for another person’s opinions. The designated witness must offer an opinion that is genuinely the witness’s own.

The reports stated that Fee and Irmiter both “contributed to, reviewed, and concur[red] with” their contents. The Cains argued that this language established a unified opinion shared by both authors. The court found the statement insufficient: it did not reveal what work Fee performed, which opinions he held, or his reasons for holding them.

Two related deficiencies therefore mattered. First, the reports did not delineate the authors’ contributions. Second, Irmiter had not been designated as an expert at all. Importantly, the court explained that even setting aside the second problem, the first justified exclusion.

The resulting principle is narrower than a prohibition on joint reports. Multiple designated experts may sometimes prepare a common report, but the record must adequately identify the testimony and supporting work attributable to each expert.

B. Naming a collaborator does not establish the designated expert’s independent analysis

The Cains attempted to distinguish an earlier decision involving an expert who relied on unidentified contributors. Here, they emphasized, Irmiter was named. The panel rejected that distinction because identification of a collaborator does not establish what the testifying expert independently analyzed.

This distinction is important. Transparency about who participated is useful, but the relevant inquiry also concerns what each person did and how the designated witness reached the proposed conclusions. Knowing the co-author’s name did not cure the absence of that information.

C. Admissibility precedes challenges to evidentiary weight

The Cains argued that uncertainty about the authors’ contributions should affect only how much weight a jury gave Fee’s testimony. The court disagreed. The adversarial process can test weaknesses in admissible expert evidence, but it does not eliminate the court’s responsibility to determine whether the evidence is admissible in the first place.

The exclusion did not rest on a finding that Fee necessarily lacked expertise or that every conclusion in the reports was scientifically incorrect. Rather, the reports did not supply a sufficiently identifiable foundation for evaluating his proposed testimony. The court left the separate question of substantive Daubert reliability unresolved.

D. Different standards of appellate review governed different rulings

The court reviewed expert exclusion for abuse of discretion, giving substantial latitude to the district judge. By contrast, it reviewed summary judgment de novo, applying the same legal standard as the district court. Denial of the Rule 59(e) motion was again reviewed for abuse of discretion.

This structure matters. The panel did not ask whether it would have managed the expert evidence identically in the first instance. It asked whether exclusion exceeded the district court’s permissible discretion. Once exclusion was upheld, it independently considered whether the remaining record could support the Cains’ claims.

E. The missing expert evidence defeated proof of additional covered loss

The causation dispute involved competing explanations for structural and other property damage: tree impact on one side, and settlement, maintenance problems, and thermal movement on the other. In the court’s view, resolving those questions required specialized construction or repair knowledge.

Without admissible expert testimony, the Cains lacked evidence establishing the cause of the disputed damage. They also conceded that they could not prove the damages sought without the FBS estimate and Fee’s testimony. Accordingly, no triable evidentiary foundation remained for their demand for additional insurance benefits.

The decision should not be read to require expert testimony in every property-insurance dispute. Its reasoning concerns damage questions that require specialized knowledge. Nor did the court independently determine that State Farm’s explanation for every disputed item was factually correct. The decisive point was the Cains’ failure to produce the admissible proof needed to proceed.

F. Relabeling claims did not overcome the contractual proof failure

The Cains argued that claims concerning delayed payment, punitive damages, and “actual cash value” survived independently of their property-damage claims. The court rejected that position, relying on Mississippi insurance law requiring an underlying contractual breach for the bad-faith claim at issue.

Because the Cains could not establish their breach-of-contract claim, their associated bad-faith theory also failed. The panel did not separately interpret an actual-cash-value provision or announce a comprehensive rule governing every conceivable extra-contractual claim. Its holding addressed the theories and evidentiary deficiencies presented in this case.

5. Precedents Cited and Their Influence

A. Appellate review and preservation

Williams v. Manitowoc Cranes, L.L.C., 898 F.3d 607 (5th Cir. 2018)

This decision supplied the abuse-of-discretion standard for reviewing expert exclusion. Its recognition of the district court’s “wide latitude” and “broad discretion” established the deferential framework within which the Cains had to show reversible error.

Guy v. Crown Equip. Corp., 394 F.3d 320 (5th Cir. 2004)

The court used this authority to explain that a “manifestly erroneous” ruling involves a plain and indisputable error amounting to disregard of controlling law. It reinforced that disagreement with the district court’s evidentiary assessment was insufficient.

Bocanegra v. Vicmar Servs., Inc., 320 F.3d 581 (5th Cir. 2003)

This case supplied the additional requirement that an erroneous evidentiary ruling affect substantial rights before reversal is warranted. Because the panel found no abuse of discretion, it did not need to conduct a separate outcome-determinative harmless-error analysis.

Newsome v. Int'l Paper Co., 123 F.4th 754 (5th Cir. 2024)

The panel cited this decision for de novo review of summary judgment under Rule 56(a). It supported independent appellate examination of whether the surviving evidence could sustain the claims after the expert materials were excluded.

Def. Distributed v. United States Dep't of State, 947 F.3d 870 (5th Cir. 2020)

This authority established abuse-of-discretion review for denial of a Rule 59(e) motion to alter or amend the judgment. It governed the Cains’ challenge to the post-judgment ruling.

Rollins v. Home Depot USA, 8 F.4th 393 (5th Cir. 2021)

The Cains argued on appeal that State Farm had challenged their disclosures improperly under local rules. Applying this preservation authority, the court held that they forfeited the objection by failing to raise it below. The panel therefore did not decide the objection’s merits.

B. Expert independence and jointly authored reports

Factory Mut. Ins. Co. v. Alon USA L.P., 705 F.3d 518 (5th Cir. 2013)

This was the principal circuit authority distinguishing permissible reliance on outside information from impermissible transmission of another person’s opinions. An expert may consider material that is not itself admissible, but may not become another person’s “mouthpiece.” That distinction directly supported the requirement to identify Fee’s own analysis.

Merrill Lynch, Pierce, Fenner & Smith, P.C. v. Greystone Servicing Corp., Inc., No. 3:06-CV-0575-P, 2010 WL 11530924 (N.D. Tex. Jan. 5, 2010)

The panel relied on this decision’s exclusion of a report that failed to identify “what testimony each individual witness will express.” It provided a close analogy: collective authorship does not excuse the obligation to disclose each witness’s proposed testimony.

Palmer v. Sun Coast Contracting Servs., Inc., No. 1:15CV34-HSO-JCG, 2017 WL 3081668 (S.D. Miss. July 19, 2017)

This case illustrated when a joint report can be accepted. Deposition testimony established the division of labor between the experts, supporting denial of a motion to strike. Its significance was not unconditional approval of joint reports, but the presence of an identifiable allocation of work.

Cooper v. Meritor, Inc., No. 4:16-CV-52-DMB-JMV, 2019 WL 545187 (N.D. Miss. Feb. 11, 2019)

The quoted principle treated a joint report as a report of each author, but limited its scope for each expert to the work that expert actually performed. This supported individual accountability within collaborative expert work.

Dale K. Barker Co., P.C. v. Valley Plaza, 541 F. App'x 810 (10th Cir. 2013)

This decision warned that joint reports can become problematic when it is unclear whether both experts adopt all opinions and the report does not identify which opinions belong to whom. The Fifth Circuit used that warning to explain why the authorities cited by the Cains did not establish admissibility here.

Hebbler v. State Farm Fire & Cas. Co., No. 1:23-CV-247-HSO-BWR, 2024 WL 5161857 (S.D. Miss. Dec. 18, 2024)

The Cains distinguished this case because its contributors were unidentified, whereas Irmiter was named. The panel found the cases analogous because the material concern was the designated expert’s failure to undertake identifiable independent analysis, not simply the anonymity of other contributors.

Authorities listed without separate substantive analysis

The opinion also listed the following authorities among those invoked by the Cains:

• Attala Steel Indus., LLC v. Travelers Indem. Co. of Am., No. 4:24-CV-53-SA-JMV, 2025 WL 2834974 (N.D. Miss. Oct. 6, 2025).
• Panetti v. Stephens, 727 F.3d 398 (5th Cir. 2013).
• Abramson v. Fla. Gas Transmission Co., 908 F. Supp. 1376 (E.D. La. 1995).
• In re: Syngenta AG Mir 162 Corn Litig., No. 14-MD-2591-JWL, 2016 WL 4593477 (D. Kan. Sept. 2, 2016).

The panel did not separately explain these decisions’ facts or holdings. Their role in this opinion was limited to the Cains’ broader contention that joint expert reports can be permissible. The court accepted that limited possibility while rejecting the proposition that joint authorship eliminates the need for identifiable individual opinions and supporting work.

C. Admissibility, reliability, and disclosure timing

United States v. 14.38 Acres of Land, More or Less Situated in Leflore Cnty., State of Miss., 80 F.3d 1074 (5th Cir. 1996)

This decision supplied the distinction between “shaky but admissible” evidence and evidence that has not crossed the admissibility threshold. It answered the Cains’ argument that cross-examination and evidentiary weight were sufficient responses to the reports’ defects.

Daubert v. Merrell Dow Pharms., Inc., 509 U.S. 579 (1993)

The opinion invoked Daubert indirectly through the preceding case’s discussion of adversarial testing. Its important qualification was that such testing concerns admissible evidence. The panel expressly declined to decide whether Fee’s proposed testimony otherwise satisfied Daubert reliability requirements.

Geiserman v. MacDonald, 893 F.2d 787 (5th Cir. 1990)

This authority concerned factors bearing on exclusion of untimely expert material. The panel cited it only to explain that it need not reach the timeliness issue. Accordingly, the opinion does not decide whether counsel’s medical circumstances justified the delayed estimate or whether the district court properly assessed the relevant timing factors.

D. Insurance causation, bad faith, and reconsideration

Johnson v. Travelers Pers. Ins. Co., 747 F. Supp. 3d 941 (S.D. Miss. 2024), aff’d, No. 24-60609, 2025 WL 958260 (5th Cir. Mar. 31, 2025)

This decision supported two steps in the court’s reasoning: the need for admissible expert evidence of property-damage causation in the circumstances presented, and the failure of a dependent bad-faith claim when the contractual claim fails.

Jackson v. State Farm Fire & Cas. Co., No. 1:23-CV-24-HSO-BWR, 2024 WL 1183670 (S.D. Miss. Mar. 19, 2024)

Cited as collecting relevant cases, this authority reinforced the requirement of expert causation evidence where the nature and source of property damage involve specialized knowledge. It supported the conclusion that the Cains could not proceed on the remaining record.

Essinger v. Liberty Mut. Fire Ins. Co., 529 F.3d 264 (5th Cir. 2008)

This circuit authority supported the Mississippi-law relationship between an insurer’s contractual obligations and actionable bad faith. The panel relied on it to reject the argument that the Cains’ bad-faith theory survived despite their inability to establish an underlying breach.

Templet v. HydroChem Inc., 367 F.3d 473 (5th Cir. 2004)

The panel used this authority when rejecting the challenge to denial of post-judgment relief. The Cains did not explain how their motion identified manifest legal or factual error, or newly discovered evidence, bearing on exclusion of the expert report. Reconsideration therefore supplied no basis for reversing the judgment.

6. Impact and Practical Significance

Collaborative expert practice

The decision favors traceable collaboration rather than isolated expert work. A practical response is to identify who performed inspections, calculations, causal analysis, and estimating work; which conclusions each designated expert will offer; and the bases for those conclusions. A collective statement of agreement is not necessarily an adequate substitute.

The opinion does not establish that every report must follow a particular format. Indeed, its discussion of Palmer v. Sun Coast Contracting Servs., Inc. recognizes that deposition testimony can clarify the allocation of work. What matters is whether the record adequately establishes the designated witness’s contribution and opinions.

Property-insurance litigation

Expert admissibility can determine the entire action when disputed causation and repair costs require specialized proof. A substantial written estimate does not necessarily create a triable issue if the associated expert foundation is inadmissible.

The decision also cautions that bad-faith allegations cannot automatically substitute for missing proof of an additional contractual entitlement. In this case, the failure of the underlying contract claim was fatal to the associated theories.

Procedural discipline

The litigation illustrates the importance of timely expert designation, early requests for scheduling relief, preservation of objections, and focused post-judgment arguments. However, because the panel did not decide the late-disclosure issue, the opinion should not be cited as holding that medical hardship can never justify an extension.

Its broader persuasive value lies in the connection it draws between individualized expert disclosure, meaningful admissibility review, and the evidentiary consequences of exclusion. Its unpublished status limits claims that it establishes a new binding circuit rule.

7. Complex Concepts Simplified

Expert designation

Formal identification of a person as a proposed expert witness. Being named as a report’s co-author is not the same as being designated to testify.

Delineation

Making clear which work, opinions, and reasoning belong to each expert. The court needed to know what Fee—not merely the FBS team—would establish.

Reliance versus “mouthpiece” testimony

An expert may use information obtained from others to form an independent opinion. The expert may not simply relay someone else’s conclusions without an identifiable analysis of the expert’s own.

Admissibility versus weight

Admissibility determines whether evidence may be considered at all. Weight determines how persuasive admitted evidence is. Cross-examination generally addresses the latter; it does not automatically cure the former.

Summary judgment

A judgment entered without trial when no genuine dispute of material fact requires trial and the moving party is entitled to judgment as a matter of law. Here, the absence of essential admissible evidence prevented the Cains from proceeding.

Abuse of discretion and de novo review

Abuse-of-discretion review gives the trial judge substantial room to make permissible decisions. De novo review independently examines the legal ruling without that same deference.

Extra-contractual claims

Claims seeking relief beyond ordinary unpaid policy benefits, such as bad-faith remedies. Their viability depends on their legal requirements, not simply on how they are labeled.

Dismissal with prejudice

A final dismissal that ordinarily prevents refiling the same claims, unlike dismissal without prejudice.

Rule 59(e) relief

A limited opportunity to seek alteration or amendment of a judgment. The Cains did not demonstrate the qualifying error or new evidence needed to disturb the judgment.

8. Conclusion

Cain v. State Farm reinforces a focused evidentiary principle: a jointly authored report must permit identification of the designated expert’s own opinions, analysis, and supporting reasons. Shared authorship and agreement did not satisfy that requirement on this record.

The resulting exclusion was decisive because the Cains needed expert evidence to establish disputed causation and damages. Their contract claim, associated bad-faith theories, and requests for post-judgment relief consequently failed. Although unpublished, the opinion provides a clear warning that collaborative expertise must remain individually accountable and procedurally usable.