Okla. Stat. tit. 43A, § 5-302
Any person may be admitted to a state mental hospital or state-operated community mental health center on a voluntary basis as an informal patient when there are available accommodations and in the judgment of the person in charge of the facility or his designee such person may require treatment therein. Such person may be admitted as an informal patient without making formal or written application therefor and any such informal patient shall be free to leave such facility on any day between the hours of 9:00 a.m. and 5:00 p.m. and at such other times as the person in charge of the facility may determine.
No person shall be admitted as an informal patient pursuant to the provisions of this section to any state mental hospital or state-operated community mental health center unless the person in charge of the facility or his designee has informed such person in writing of the following:
Laws 1985, c. 116, § 1, eff. November 1, 1985; Renumbered from 43A O.S. § 560 by Laws 1986, c. 103, § 103, eff. November 1, 1986.