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Supreme Court of Texas hears dispute over excluded expert testimony in Diamond Hydraulics case

Supreme Court of Texas · December 4, 2025
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Summary

At oral argument in Diamond Hydraulics v. GAC Equipment, counsel for Diamond Hydraulics defended the trial court's exclusion of late-designated expert testimony under Texas discovery rules, while opposing counsel pressed that alternatives such as depositions or remote testimony could have cured any prejudice.

At oral argument before the Supreme Court of Texas, counsel for Diamond Hydraulics (Speaker 1) told the justices the trial court did not abuse its discretion when it excluded expert testimony that was designated well past the court's deadline. "We think that there are 3 major errors that require reversal," Speaker 1 said, identifying exclusion of expert proof and related due-process concerns as central issues.

Speaker 1 urged the court that the excluded testimony was the product of litigation choices by Diamond Hydraulics, not circumstances beyond the party's control: "This case was about a party that repeatedly failed to comply with the deadline to designate experts," Speaker 1 said, arguing that strategic decisions not to take deposition testimony or to decline offered remote testimony did not constitute "good cause" under Rule 193.6 and the court's Alvarado…

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