(a) Except as otherwise provided by this section, a veterinarian may not possess on association grounds a controlled substance, as defined by the Texas Controlled Substances Act, Health and Safety Code, Chapter 481, unless the controlled substance is on an approved list developed by the executive secretary.(b) Except as otherwise provided by this section, a veterinarian may not possess on association grounds a prohibited drug, chemical, or other substance listed as a Class I or Class II substance on the latest version of the classification developed under §319.304 of this title (relating to Penalties on Positive Test), unless the substance is on an approved list developed by the executive secretary.(c) The commission veterinarian shall post the approved lists developed under this section in the commission veterinarian's office and in a prominent place that will ensure access by veterinarians and other interested persons.(d) A veterinarian must obtain prior written approval from the commission veterinarian to possess a substance which is not on the approved list. The commission veterinarian may not approve the possession of a substance which is not on the approved list unless the person requesting approval submits documentation in recognized veterinary journals or by recognized veterinary experts that the substance has a proven beneficial, therapeutic application for a horse or greyhound in race training.(e) A person may not prescribe, provide, obtain, order, administer, possess, dispense, give or deliver a controlled substance, prescription drug, or legend drug to or for a race animal solely for training or racing purposes.