What Beavan v. Allergan Means for the Reliability of Evidence in Eminent Domain Cases

Judges act as gatekeepers between expert opinions and the jury box. When they let unreliable testimony through, jurors can reach conclusions that have little to do with the facts. A recent New Jersey Supreme Court decision, Beavan v. Allergan U.S.A., Inc., sharpens that gatekeeping duty and raises the bar for how courts test the reliability of evidence before trial.

Although the case grew out of a product liability dispute, its reasoning reaches straight into eminent domain litigation, where a single expert’s valuation opinion can decide who wins. For any eminent domain attorney in NJ, this ruling is required reading since it reshapes how judges treat appraisal testimony at trial.

What Did Beavan v. Allergan Decide?

The case began when the plaintiff claimed a defective eye drug left her with severe injuries and blindness. To prove the drug caused her injuries, she relied on two expert witnesses: Dr. Lalezary, who submitted a written report, and Dr. Phillips, who did not.

At trial, the defense asked the court to exclude both experts. The trial court refused, ruling that the testimony was adequately grounded in fact and data under N.J.R.E. 702 and 703 and that it did not amount to unsupported “net opinions.” The Appellate Division disagreed. It found both experts offered net opinions, excluded their testimony, and awarded the defendant summary judgment, since the plaintiff could no longer prove her injuries were caused by the drug.

How Does the Accutane Reliability Test Work?

On appeal, the Supreme Court turned to In re Accutane Litigation, which set the modern standard for reviewing expert testimony in New Jersey. Accutane assigns trial judges a gatekeeping role: before a jury hears an opinion, the judge must evaluate both the expert’s methodology and the data behind it.

Courts weigh four Accutane factors when testing reliability:

• Testability: Whether the expert’s theory can be tested or proven false
• Peer review and publication: Whether the methodology has been reviewed and published by other experts in the field
• Error rate and standards: Whether the method carries a known error rate and defined standards for how it’s applied
• General acceptance: Whether the scientific community accepts the method

These factors aren’t a rigid checklist. Courts weigh them flexibly, alongside other case specific facts, but the goal stays the same: a rigorous review, not a rubber stamp.

Applying that standard, the Supreme Court found the trial court skipped this step entirely. It never conducted the reliability analysis Accutane requires, so the Appellate Division’s ruling was premature. The Court sent the case back to the trial court for a proper Accutane hearing.

Why Does This Matter for Eminent Domain and Property Tax Cases?

Beavan grew out of a pharmaceutical dispute, but its logic transfers directly to property valuation cases. Property owners routinely rely on appraisers to testify about fair market value, and that testimony often decides the outcome of a condemnation lawsuit.

Once a case reaches trial, both sides typically bring in competing appraisers, and the judge must sort out whose methodology actually holds up before the jury ever hears a number. That same dynamic plays out on the tax side of the practice. Anyone working with a property tax appeal attorney faces a similar fight, since county tax boards and the Tax Court apply the same reliability of evidence standard to valuation opinions.

New Jersey courts have already refined how judges should test expert reliability in this setting. Caoili v. State of New Jersey requires a judge to find a “reasonable probability” of a zoning change before a jury can hear evidence about it. State v. Gorga applies that same threshold. Borough of Saddle River v. 66 East Allendale, LLC confirms that once reliability is established, juries may weigh how a likely zoning change affects fair market value.

Beavan reinforces all of it. Judges can no longer let an appraiser testify on experience alone. They must confirm the valuation method rests on accepted appraisal principles and sufficient facts, especially when the opinion depends on a claimed future zoning change. Speculation about rezoning won’t hold up in court. It needs support from market data, planning history, and other objective evidence.

What Is Eminent Domain, and How Is It Different From Condemnation?

If you’re new to this area of law, start with the definition of eminent domain: the government’s constitutional power to take private property for public use in exchange for just compensation.

It also helps to understand condemnation vs. eminent domain, since the two terms get used interchangeably, though condemnation is the legal process used to carry out a taking. Once a case moves forward, expert testimony usually decides how much compensation the property owner receives.

What About Taxes on Eminent Domain Compensation?

Compensation raises its own questions, too. Property owners should understand eminent domain tax treatment before accepting a settlement, since the payment can carry federal and state tax consequences depending on how it’s structured.

A property tax lawyer NJ owners trust can help sort out the valuation and tax questions together, especially when a case touches both a taking and an ongoing tax appeal.

The Bottom Line on Reliability of Evidence

Beavan reinforces something eminent domain practitioners already know: expert testimony can decide a case, but its admissibility depends on the reliability of evidence behind it. The decision raises the bar for the admissibility of expert reports across the board, whether the dispute involves a pharmaceutical claim or a fair market value opinion.

For property owners, condemning authorities, and appraisers alike, the message is the same: valuation opinions need sound methodology, sufficient facts, and careful analysis long before they ever reach a jury.

Protect Your Case Before It Reaches a Jury

Whether you’re facing a condemnation lawsuit or fighting a property tax assessment, the strength of your expert’s testimony can decide the outcome. Talk with the eminent domain and property tax attorneys at MROD before your valuation experts ever take the stand. Schedule a free consultation today.