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TEXAS RULES OF CIVIL PROCEDURE / RULE 81
TRCP 81: Defensive matters
Defensive pleadings and conditional oath requirements for plaintiffs.
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When the defendant sets up a counter claim, the plaintiff may plead thereto under rules prescribed for pleadings of defensive matter by the defendant, so far as applicable. Whenever the defendant is required to plead any matter of defense under oath, the plaintiff shall be required to plead such matters under oath when relied on by him.