Harmless-Error Affirmance Where Disputed Lay/Expert Yield Estimates Do Not Cure a Failure of Proof on Conversion

1. Introduction

Valley View Farms v. BOS Dairy LLC (7th Cir. Aug. 24, 2026) arises out of a long-running silage-growing arrangement between Valley View Farms (an Illinois partnership and lessor/producer) and two Indiana dairies, Bos Dairy LLC and Herrema Dairy LLC (collectively, the “Dairies”). Valley View alleged that the Dairies converted corn silage by underreporting harvested tonnage from Valley View’s fields.

The appellate dispute centered on evidence: at trial, three forage-harvester (“chopper”) operators testified—over objection—to estimated tons-per-acre yields based on their personal harvesting experience and observations. Valley View argued those estimates were undisclosed expert opinions inadmissible under Federal Rule of Evidence 702 and Federal Rule of Civil Procedure 26(a)(2), and not permissible lay opinions under Federal Rule of Evidence 701.

The Seventh Circuit affirmed a defense verdict, holding that—even assuming the trial court erred in admitting the operators’ yield estimates— any error was harmless because Valley View failed to prove conversion by a preponderance of the evidence under Indiana law.

2. Summary of the Opinion

  • The panel declined to decide whether the chopper operators’ yield estimates were properly admitted as Rule 701 lay opinions or should have been treated as Rule 702 expert testimony.
  • Instead, it affirmed on harmless-error grounds: Valley View’s proof of conversion was insufficient regardless of the disputed testimony.
  • Applying Indiana conversion principles, the court emphasized the absence of direct evidence of diversion or unauthorized control and the weaknesses in Valley View’s circumstantial case (especially the crop adjuster’s appraisal).

3. Analysis

3.1 Precedents Cited

Standards of review for expert evidence; lay vs. expert classification

The opinion relies on Compania Administradora de Recuperacion de Activos Administradora de Fondos de Inversion Sociedad Anonima v. Titan Int'l, Inc., 533 F.3d 555 (7th Cir. 2008) (“Titan”), for two key propositions:

  • Abuse of discretion governs review of the decision to admit or exclude expert testimony.
  • But if the district court’s classification of testimony as lay or expert turns on interpreting the Federal Rules of Evidence, that legal interpretation is reviewed de novo.

The panel also cites Von der Ruhr v. Immtech Int'l, Inc., 570 F.3d 858 (7th Cir. 2009), alongside Titan, to underscore that Rule 701’s boundary with Rule 702 can be “a fine line”—a framing that sets up the court’s decision to bypass the classification question and resolve the appeal on harmlessness.

Harmless error and the threshold for a new trial

The court grounds harmless-error analysis in Hall v. Flannery, 840 F.3d 922 (7th Cir. 2016), invoking the principle (quoting Fed. R. Civ. P. 61) that reversal is unwarranted unless an evidentiary error affects “substantial rights.” It then uses Anderson v. Raymond Corp., 61 F.4th 505 (7th Cir. 2023), to articulate the operative test: evidentiary error merits a new trial only if it had a “substantial and injurious effect or influence” on the jury’s verdict.

Together, Hall and Anderson supply the doctrinal lever the panel uses to affirm without definitively answering the Rule 701/702 question: if the plaintiff’s case fails as a matter of proof, disputed rebuttal testimony is unlikely to have driven the outcome.

Choice of law (Indiana) and the elements/burden for civil conversion

Because jurisdiction was based on diversity, the panel applies Indiana substantive law to the conversion claim, citing Deckard v. Gen. Motors Corp., 307 F.3d 556 (7th Cir. 2002), for the general Erie choice-of-law approach.

On conversion, it quotes the Indiana criminal conversion statute, Ind. Code § 35-43-4-3 (“knowingly or intentionally exerts unauthorized control over property of another person”), and cites JET Credit Union v. Loudermilk, 879 N.E.2d 594 (Ind. Ct. App. 2008), for the proposition that a civil plaintiff may recover for criminal conversion by proving the criminal act by a preponderance of the evidence (a lower burden than “beyond a reasonable doubt”).

3.2 Legal Reasoning

(a) The court’s deliberate avoidance of the Rule 701/702 line

The panel acknowledged that the operators’ tons-per-acre estimates “toe the fine line between lay and expert testimony.” That framing matters: it signals that the question was close enough that the appeal could have turned on nuanced evidentiary doctrine. Yet the court chose a narrower path—harmless error—consistent with appellate restraint, especially where the verdict can be sustained on an alternative ground.

(b) Why harmlessness followed from Valley View’s failure of proof

The court’s harmlessness conclusion rests on a straightforward causal analysis: even excluding the operators’ estimates, Valley View still lacked sufficient evidence that the Dairies “knowingly or intentionally” exerted “unauthorized control” over the silage.

The opinion highlights several proof deficiencies:

  • No direct evidence of diversion or under-weighing. Valley View’s witnesses could not identify where allegedly missing silage went or how it bypassed weighing/reporting.
  • The circumstantial cornerstone was shaky. The crop adjuster’s pre-harvest appraisal was undermined on cross-examination (uncertainty about field coverage, sample locations, too few samples, and failure to adjust to 34% dry matter required by contract).
  • Substantial contrary testimony remained. Even without the three operators, the Dairies presented numerous other witnesses (seventeen, by the panel’s count after excluding the operators) testifying there was no impropriety during harvest.

Against that record, the panel found no “firm conviction” that admission of the operators’ opinions could have affected the jury’s decision, making any evidentiary error non-prejudicial under Anderson v. Raymond Corp..

3.3 Impact

Although designated NONPRECEDENTIAL DISPOSITION (citable only under Fed. R. App. P. 32.1), the order offers a clear practical lesson for litigants in civil conversion (and analogous tort) cases in federal court:

  • Harmless error will often defeat evidentiary appeals when the appellant lacks affirmative proof on an element. Even a plausible Rule 701/702 misclassification may not matter if the proponent of the claim cannot show unauthorized control by a preponderance.
  • Conversion claims cannot be built on yield-discrepancy inference alone without reliable linkage to “unauthorized control.” A higher estimated yield does not itself establish that harvested material was diverted, unweighed, or misreported intentionally.
  • Methodological weaknesses in “expected yield” evidence are case-critical. The court treated cross-examination exposing deviations from the claimed “industry standard” and failure to match the contract’s dry-matter adjustment as strongly eroding the inference of wrongdoing.

4. Complex Concepts Simplified

  • Lay opinion (Rule 701) vs. expert opinion (Rule 702): A lay witness can give opinions based on everyday reasoning and personal perception (e.g., “it looked heavy”). Expert testimony is required when the opinion depends on “scientific, technical, or other specialized knowledge.” Here, estimating tons per acre based on machine speed, crop height, and soil quality may draw on specialized harvesting experience—hence the “fine line.”
  • Disclosure of experts (Rule 26(a)(2)): If a party plans to use expert opinions, it generally must disclose the expert and provide required information ahead of trial. Valley View argued the Dairies failed to do this for the operators.
  • Harmless error (Rule 61): Not every mistake leads to a new trial. An appellate court asks whether the mistake likely changed the outcome. If the losing party’s case was weak on the essentials, the error is often deemed “harmless.”
  • Civil action for criminal conversion in Indiana: Indiana permits a civil lawsuit based on conduct that meets the criminal definition of conversion. The civil plaintiff must prove the conversion occurred, but only by a “more likely than not” standard (preponderance).

5. Conclusion

Valley View Farms v. BOS Dairy LLC affirms a defense verdict not by definitively resolving whether experienced operators’ yield estimates are lay or expert testimony, but by holding that any arguable evidentiary misstep was harmless. The decisive point was Valley View’s inability to prove—directly or via reliable circumstantial evidence—that the Dairies exercised unauthorized control over the silage as Indiana conversion law requires.

The opinion’s broader significance lies in its litigation signal: when a party’s claim fails on elemental proof, appellate courts are likely to treat close evidentiary questions—especially those “toeing the fine line” between Rules 701 and 702—as non-outcome-determinative.