Expert Opinions Need Record Support: Pascocello v Jibone and the Foundation Rule for Photographs

Key Takeaways

• An expert’s opinion “must be based on facts in the record or personally known to the witness” (Hambsch v New York City Tr. Auth.) — without record support it has no probative force.
• In Pascocello v Jibone, the First Department upheld preclusion of an expert opinion built on photographs for which no foundation had been laid.
• Experts cannot be used as a back door to put unauthenticated photographs or documents before the jury.
• Lay the foundation for every exhibit your expert relies on before the expert takes the stand.

In New York personal injury litigation, expert testimony plays a crucial role in establishing causation, damages, and the standard of care. However, courts maintain strict rules about what evidence experts can rely upon when forming their opinions. The foundation requirement ensures that expert testimony is based on reliable, admissible evidence rather than speculation or improperly introduced materials.

This evidentiary principle becomes particularly important when experts attempt to base opinions on photographs, medical records, or other documentary evidence. Without proper foundation establishing the authenticity, accuracy, and relevance of such materials, courts will exclude expert opinions that rely on them. This requirement protects the integrity of the judicial process and ensures that juries receive reliable expert testimony.

The foundation requirement is especially critical in personal injury cases where biomechanical evidence or photographic evidence might be used to reconstruct accident scenarios or demonstrate injury mechanisms. Courts have consistently held that experts cannot simply rely on any materials without proper evidentiary support, as seen in cases involving foundation requirements.

The Decision

Jason Tenenbaum’s Analysis:

Pascocello v Jibone, 2018 NY Slip Op 03466 (1st Dept. 2018)

“An expert’s opinion “must be based on facts in the record or personally known to the witness” (Hambsch v New York City Tr. Auth., 63 NY2d 723, 725 ; see Roques v Noble, 73 AD3d 204, 206 ), and in the absence of such record support, an expert’s opinion is without probative force (see Diaz v New York Downtown Hosp., 99 NY2d 542, 544 ). Here, Supreme Court properly precluded Dr. Toosi from offering an opinion based on photographs for which no proper foundation had been established.

The Legal Framework: Hambsch, Roques, and Diaz

The rule applied in Pascocello is decades old and remarkably stable. The Court of Appeals in Hambsch v New York City Transit Authority fixed the baseline: an expert may opine only from facts in the record or facts personally known to the witness. Diaz v New York Downtown Hospital supplies the consequence — an opinion lacking that support is “without probative force,” meaning it cannot defeat summary judgment or sustain a verdict. Roques v Noble carried the principle into the Appellate Division’s everyday summary judgment practice.

Photographs sit at the intersection of these rules. A photograph generally comes into evidence through a witness with personal knowledge who testifies that it fairly and accurately depicts what it purports to show. When no such witness authenticates the image, the photograph is not “in the record” in any meaningful sense — and an expert who builds an opinion on it is opining on facts that exist nowhere in admissible form. That is precisely the maneuver the trial court stopped, and the First Department endorsed stopping, in Pascocello.

Why This Matters for Trial Lawyers

For plaintiffs’ attorneys, the decision is a reminder that the expert disclosure is only half the job. If the expert’s causation or damages opinion depends on photographs — vehicle damage photos, scene photos, injury photos — someone with personal knowledge has to authenticate them first. An expert cannot bootstrap the exhibits into evidence, and an opinion announced without its factual predicate may be precluded outright, with no second chance in front of the jury.

For defense counsel, Pascocello is a preclusion tool. Cross-checking each opinion in the expert disclosure against the actual trial record — what has been admitted, what the expert personally observed — frequently reveals opinions floating free of any foundation. A motion in limine framed around Hambsch and Diaz can strip those opinions before openings.

The same record-support logic drives summary judgment practice in threshold and causation disputes, where courts routinely disregard expert affirmations untethered to admissible proof — a dynamic familiar from pre-existing injury litigation in New York personal injury cases, where experts must engage the actual medical record rather than assume facts not established.

Practice Pointers

• Map every expert opinion to its evidentiary source before trial: record cite, personal observation, or properly admitted exhibit.
• Authenticate photographs through a percipient witness — the plaintiff, an investigating officer, a treating provider — before the expert references them.
• Move in limine early. Foundation objections raised mid-testimony invite curative attempts; a pretrial ruling locks the issue down.
• Remember the summary judgment corollary: an expert affirmation without record support has no probative force and will not raise (or defeat) a triable issue of fact.

Frequently Asked Questions

What must an expert opinion be based on in New York?

Under Hambsch v New York City Transit Authority, an expert’s opinion must rest on facts in the record or facts personally known to the witness. An opinion lacking that support has no probative force under Diaz v New York Downtown Hospital.

Can an expert testify about photographs that were never admitted into evidence?

No. As Pascocello v Jibone confirms, a court may preclude an expert from offering an opinion based on photographs for which no proper foundation was established. The photographs must be authenticated — typically by a witness with personal knowledge — before an expert may rely on them.

How do you lay a foundation for a photograph at trial?

A witness familiar with the scene or subject testifies that the photograph fairly and accurately represents what it depicts as of the relevant time. Once admitted, the photograph becomes record evidence an expert can permissibly rely on.

Related Resources

• Pre-Existing Injuries in New York Personal Injury Cases — the firm’s cluster hub on injury causation proof
• The firm’s Legal Encyclopedia
• Personal Injury practice page
• Foundation Requirements in Medical Malpractice Expert Testimony
• Expert opinion
• The expert opinion