Texas Health and Safety Code - HEALTH & SAFETY § 501.031. Examinations and Investigations

(a) To enforce this chapter, an officer, employee, or agent of the department, on the presentation of appropriate credentials to the owner, operator, or agent, at reasonable times may enter a factory, warehouse, or establishment in which a hazardous substance is manufactured, processed, packaged, or held for introduction into commerce in this state or in which a hazardous substance is held after introduction into commerce, or a vehicle used to transport or hold a hazardous substance in commerce, for the purpose of inspecting within reasonable limits and in a reasonable manner the factory, warehouse, establishment, or vehicle and all pertinent equipment, finished and unfinished materials, and labeling in the factory, warehouse, establishment, or vehicle.

(b) The officer, employee, or agent of the department may obtain samples of any materials, packaging, labeling, or finished product.