Tex. Civ. Prac. & Rem. Code 84.004(a)
Liability: Charitable Volunteer
An individual who provides volunteer services, within the scope of the individual’s duties for a charitable organization, will not be held legally responsible for acting or failing to act. They can be held legally responsible if acting with extreme carelessness or with intent to cause harm. The individual can be held legally responsible if injury, death, or damage to property is caused by the individual’s operation of a motor vehicle.
(a) Except as provided by Subsection (d) and Section 84.007, a volunteer of a charitable organization is immune from civil liability for any act or omission resulting in death, damage, or injury if the volunteer was acting in the course and scope of the volunteer’s duties or functions, including as an officer, director, or trustee within the organization.