Okla. Stat. tit. 84, § 856
In the absence of evidence to the contrary, the certificate of the authorized person is conclusive of the formal validity of the instrument as a will under the Uniform International Wills Act. The absence or irregularity of a certificate does not affect the formal validity of a will under the Uniform International Wills Act.
Laws 2010, SB 889, c. 383, § 7, eff. November 1, 2010.