Okla. Stat. tit. 12 § 577.2
Whenever Oklahoma Uniform Jury Instructions (OUJI) contains an instruction applicable in a civil case or a criminal case, giving due consideration to the facts and the prevailing law, and the court determines that the jury should be instructed on the subject, the OUJI instructions shall be used unless the court determines that it does not accurately state the law. Whenever OUJI does not contain an instruction on a subject on which the court determines that the jury should be instructed, the instruction given on that subject should be simple, brief, impartial and free from argument. Counsel for either party or parties shall have a right to request instructions by so requesting in writing.
Each instruction shall be accompanied by a copy, and a copy shall be delivered to opposing counsel. In addition to numbering the copies and indicating who tendered them, the copy shall contain a notation substantially as follows:
"OUJI No. ______" or "OUJI No. ______Modified" or "Not in OUJI" as the case may be.
Okla. Stat. tit. 12, § 577.2