Tex. Fam. Code § 160.621
(a) Except as otherwise provided by Subsection (c), a report of a genetic testing expert is admissible as evidence of the truth of the facts asserted in the report. The admissibility of the report is not affected by whether the testing was performed:
(c) If a child has a presumed, acknowledged, or adjudicated father, the results of genetic testing are inadmissible to adjudicate parentage unless performed:
(d) Copies of bills for genetic testing and for prenatal and postnatal health care for the mother and child that are furnished to the adverse party on or before the 10th day before the date of a hearing are admissible to establish:
Added by Acts 2001, 77th Leg., ch. 821, Sec. 1.01, eff. June 14, 2001.