(a) In this section, "ward" has the meaning assigned by Section 1002.030, Estates Code.
(b) A person may not administer a psychoactive medication to a client who refuses to take the medication voluntarily unless:
(1) the client is having a medication-related emergency;
(2) the client is under an order issued under Section 592.156 authorizing the administration of the medication regardless of the client's refusal; or
(3) the client is a ward who is 18 years of age or older and the guardian of the person of the ward consents to the administration of psychoactive medication regardless of the ward's expressed preferences regarding treatment with psychoactive medication.