Okla. Stat. tit. 59, § 731.2
Proof that any class of person identified in Section 725.2 of this title appends to his name the word "Doctor", the abbreviation "Dr.", or any other word, abbreviation or designation, which word, abbreviation or designation, indicate that he or she is qualified for diagnosis or treatment, as herein defined, shall constitute prima facie evidence that he or she is holding himself or herself out, within the meaning of this act, as qualified to engage in diagnosis or treatment.
Laws 1947, p. 358, § 2, emerg. eff. May 22, 1947; Amended by Laws 1993, SB 139, c. 168, § 3, eff. September 1, 1993.