Okla. Stat. tit. 21, § 1574

If any officer authorized to take the acknowledgment or proof of any conveyance of real property, or of any other instrument which by law may be recorded, knowingly and falsely certifies that any such conveyance or instrument was acknowledged by any party thereto, or was proved by any subscribing witness, when in truth such conveyance or instrument was not acknowledged or proved as certified, he is guilty of forgery in the second degree, a Class D1 felony offense.