Wash. Rev. Code § 69.41.080
Humane societies and animal control agencies registered with the commission under chapter 69.50 RCW and authorized to euthanize animals may purchase, possess, and administer approved legend drugs for the sole purpose of sedating animals prior to euthanasia, when necessary, and for use in chemical capture programs. For the purposes of this section, "approved legend drugs" means those legend drugs designated by the commission by rule as being approved for use by such societies and agencies for animal sedating or capture and does not include any substance regulated under chapter 69.50 RCW. Any society or agency so registered shall not permit persons to administer any legend drugs unless such person has demonstrated to the satisfaction of the commission adequate knowledge of the potential hazards involved in and the proper techniques to be used in administering the drugs.
The commission shall promulgate rules to regulate the purchase, possession, and administration of legend drugs by such societies and agencies and to insure strict compliance with the provisions of this section. Such rules shall require that the storage, inventory control, administration, and recordkeeping for approved legend drugs conform to the standards adopted by the commission under chapter 69.50 RCW to regulate the use of controlled substances by such societies and agencies. Chapter 18.64 RCW governs the denial of licenses and the discipline of registrations issued under chapter 69.50 RCW. The uniform disciplinary act, chapter 18.130 RCW, governs unlicensed practice of persons required to obtain a registration under this chapter. In addition to any other grounds, the commission may suspend or revoke a registration issued under chapter 69.50 RCW upon a determination by the commission that the person administering legend drugs has not demonstrated adequate knowledge as herein provided.
RCW 69.41.080