Okla. Stat. tit. 63, § 63-3101.15: Directives executed prior to change in law

A. Any directive to a physician executed pursuant to the former

Oklahoma Natural Death Act, 63 O.S. 1991, Section 3101 et seq.,

which was executed prior to September 1, 1992, shall be enforceable

according to its terms until revoked and shall have the same force

and effect as if made pursuant to this act. Such directive shall be

binding on the attending physician whether or not the person who

executed the directive was in a terminal condition at the time of

execution unless there is evidence that the person executing the

directive intended that it should be binding only if executed or re-

executed after the person became afflicted with a terminal condition

as defined by the former Oklahoma Natural Death Act.

B. Any advance directive executed prior to the enactment of any

amendment to the Oklahoma Advance Directive Act which substantially

complied with the law in effect at the time of the execution of the

directive shall be enforceable according to its terms until revoked

and shall have the same force and effect as if made pursuant to this

act, as amended.