Okla. Stat. tit. 43A, § 43A-11-102: Legislative findings

A. The Legislature finds that all competent persons have the

fundamental right to control decisions relating to their own mental

health treatment, including the decision to accept mental health

treatment.

B. A capable adult may make an advance directive of mental

health treatment preferences or instruction which may include, but

is not limited to, consent to mental health treatment.