Tex. R. Civ. P. 228
As amended through August 27, 2024
A challenge for cause is an objection made to a juror, alleging some fact which by law disqualifies him to serve as a juror in the case or in any case, or which in the opinion of the court, renders him an unfit person to sit on the jury. Upon such challenge the examination is not confined to the answers of the juror, but other evidence may be heard for or against the challenge.
Tex. R. Civ. P. 228