Is a judge required to hold a hearing before allowing an expert to testify in court?

This question has been addressed in 1 Texas court opinion:

In the Interest of A.J., A Child

COA12 — February 18, 2026

The Twelfth Court of Appeals affirmed a jury verdict appointing paternal grandparents as joint managing conservators with the right to designate the child's primary residence. The parents challenged the grandparents' standing to intervene and the trial court's admission of third-party psychological evaluations. The court held that the standing issue was previously settled in a mandamus proceeding and could not be relitigated. Furthermore, the court determined that even if the psychological reports were improperly admitted as hearsay, the error was harmless because the parents failed to object to subsequent testimony discussing the contents of those reports, making the evidence cumulative.

Litigation Takeaway

“Winning an evidentiary objection to a document is not enough if you allow witnesses to testify about that document's contents without further objection. To avoid the 'cumulative evidence' trap, practitioners must secure a running objection to ensure that similar testimony doesn't waive the initial error on appeal.”