Tex. Fam. Code § 160.508
(a) Subject to Subsection (b), if a genetic testing specimen for good cause and under circumstances the court considers to be just is not available from a man who may be the father of a child, a court may order the following individuals to submit specimens for genetic testing:
Added by Acts 2001, 77th Leg., ch. 821, Sec. 1.01, eff. June 14, 2001.