Tex. Civil Practice and Remedies Code § 82.005

(a) In a products liability action in which a claimant alleges a design defect, the burden is on the claimant to prove by a preponderance of the evidence that:

(1) there was a safer alternative design; and

(2) the defect was a producing cause of the personal injury, property damage, or death for which the claimant seeks recovery.

(b) In this section, "safer alternative design" means a product design other than the one actually used that in reasonable probability:

(1) would have prevented or significantly reduced the risk of the claimant's personal injury, property damage, or death without substantially impairing the product's utility; and

(2) was economically and technologically feasible at the time the product left the control of the manufacturer or seller by the application of existing or reasonably achievable scientific knowledge.

(c) This section does not supersede or modify any statute, regulation, or other law of this state or of the United States that relates to liability for, or to relief in the form of, abatement of nuisance, civil penalties, cleanup costs, cost recovery, an injunction, or restitution that arises from contamination or pollution of the environment.

(d) This section does not apply to:

(1) a cause of action based on a toxic or environmental tort as defined by Sections 33.013(c)(2) and (3); or

(2) a drug or device, as those terms are defined in the federal Food, Drug, and Cosmetic Act (21 U.S.C. Section 321).

(e) This section is not declarative, by implication or otherwise, of the common law with respect to any product and shall not be construed to restrict the courts of this state in developing the common law with respect to any product which is not subject to this section.