How do Texas discovery rules work for withholding or excluding evidence?
This question has been addressed in 2 Texas court opinions:
In re Mitsubishi Heavy Industries America, Inc.
COA09 — February 20, 2026
In re Mitsubishi Heavy Industries America, Inc. involved a discovery dispute where a relator sought to shield alleged trade secrets from production. The Beaumont Court of Appeals analyzed the burden-shifting framework of Texas Rule of Evidence 507 and the procedural requirements of Rule of Civil Procedure 193.3, concluding that the relator provided only general categorical descriptions of documents rather than a specific privilege log. The court held that the relator's failure to affirmatively request an in-camera inspection prevented the trial court from making a reasoned determination on the privilege, thereby rendering the petition for mandamus relief premature.
Litigation Takeaway
“To successfully protect trade secrets or proprietary business information in discovery, you must do more than simply object; you must provide a detailed privilege log and formally request an in-camera inspection. Failing to provide the trial court with the specific documents for review waives your ability to seek mandamus relief, as the appellate court cannot find an abuse of discretion without a record of the specific evidence at issue.”
Caldwell v. Quaid
COA14 — February 5, 2026
In a divorce proceeding involving complex property characterization, the Husband designated an expert for tracing and valuation but failed to provide the actual tracing reports until six days before trial. The trial court excluded the late-disclosed tracing testimony while permitting testimony on the timely-disclosed valuation. On appeal, the Husband argued the exclusion constituted an improper 'death-penalty' sanction. The Fourteenth Court of Appeals affirmed the trial court's ruling, clarifying that the exclusion was a mandatory application of Texas Rule of Civil Procedure 193.6. The court held that because the ruling did not preclude the Husband's entire defense or claim, it did not rise to the level of a death-penalty sanction and was a proper exercise of discretion due to the lack of good cause or showing of non-prejudice.
Litigation Takeaway
“Discovery deadlines are strictly enforced for expert reports in property disputes; a trial continuance does not automatically reset these deadlines. Practitioners should never use 'to be provided' as a placeholder in expert designations and must produce the substance of tracing opinions within the discovery period to avoid the 'automatic' exclusion of evidence under Rule 193.6.”