The Line Between Analysis and Advocacy: What the High Court’s Recent Family Law Ruling Means for Instructing Solicitors.
Expert evidence is an indispensable asset in modern Irish family law. Judges are routinely asked to make deeply challenging decisions regarding child welfare, access, and parental capacity, relying heavily on specialized behavioural and psychological data that sits outside the court’s own training.
However, a fine legal line exists between an expert assisting the court and an expert attempting to substitute the judge’s own function. When that line is crossed, the entire integrity of the proceedings is compromised.
This boundary was brought into sharp focus by the High Court’s landmark August 2026 ruling delivered by Mr. Justice Garrett Simons. In a rare intervention, the High Court quashed a District Court family law order in its entirety, finding that the first-instance decision-making process was fundamentally flawed and resulted in a denial of justice.
A core issue highlighted by contemporary jurisprudence is a trend that the superior courts will no longer tolerate: expert witnesses overstepping their remits to act as partisan mouthpieces or advocates for a specific party.
The Danger of Partisan Advocacy in Court Reports
The fundamental duty of any expert witness in Ireland is codified under Order 39 of the Rules of the Superior Courts: an expert owes an overriding duty to the Court, not to the instructing or paying party.
When a court-appointed or independently instructed assessor begins to act as an advocate, several systemic failures occur:
* The Erosion of Independence: The report ceases to be an objective evaluation of facts and behavioral patterns, transforming instead into a tool designed to achieve a predetermined outcome.
* Flawed Fact-Finding: As noted by Mr. Justice Simons, a partisan approach leads to hostile, unexamined assumptions against one party, causing a failure to properly ascertain vital elements, such as the constitutional requirement to hear the voice of the child.
* Total Exclusion of Evidence: Irish appellate courts have made it clear, most notably in the seminal case of Duffy v McGee, that if an expert acts as an advocate, the court has the absolute right to attach zero weight to the report or exclude the evidence completely.
Aligning with the 2026 Judicial Guidelines
This High Court intervention follows the launch of the new Judicial Guidelines on Expert Reports in Family Law proceedings. These strict guidelines explicitly state that an expert’s role is to provide an independent, objective, and impartial opinion, and that they must never act as a fact-finder, final decision-maker, or advocate.
For solicitors, the lesson is clear. Instructing an expert who tells you or your client exactly what you want to hear is a profound litigation risk. If the underlying methodology cannot survive rigorous, objective scrutiny under cross-examination, the entire case structure can collapse.
Our Commitment to Evidentiary Objectivity
At the Forensic Behavioural Analysis Center, we operate under the strict principle that our primary allegiance is to the Court. Led by Teresa Clyne (MSc in Law, Criminology, and Forensic Psychology), our independent assessments focus exclusively on verifiable behavioral patterns, environmental triggers, and structured data collection.
By remaining fiercely objective and non-partisan, we ensure that our Section 32 and Section 47 assessments provide judges and legal teams with robust, legally compliant reports that hold up under judicial examination.
For inquiries regarding Section 32 or Section 47 report availability, or to discuss an independent evidential review, contact our office info@teresaclyne.ie