The commission may suspend or revoke a registration issued under chapter 69.50 RCW if the commission determines that any agent or employee of a registered humane society or animal control agency has purchased, possessed, or administered legend drugs in violation of RCW 69.41.080 or 69.50.310, or this chapter or has otherwise demonstrated inadequate knowledge in the administration of legend drugs. The commission's revocation or suspension of a registration would restrict the registered entity's ability to use both approved legend drugs and sodium pentobarbital.