Okla. Stat. tit. 10, § 1419a
C. Within ten (10) days of receipt of the notification of the right to a trial de novo, the career teacher may file a petition for a trial de novo.
Upon filing the petition, the court clerk shall issue a summons and cause service by mail to be made upon the State Department of Rehabilitation Services by certified mail, restricted delivery with return receipt requested, or substitute process as provided by law.
F. Except as otherwise provided specifically in this section, the law generally applicable to civil suits filed in district court shall apply to the proceedings for trial de novo under this section. At the trial de novo the standard of proof shall be by the preponderance of the evidence and the burden of proof shall be on the State Department of Rehabilitation Services to establish de novo that the career teacher’s dismissal or nonreemployment is warranted. The trial de novo shall proceed as a nonjury trial before the court. The court shall determine de novo all issues of fact and law necessary for full adjudication of the dispute at the trial. The court shall not, by applying principles of collateral estoppel or res adjudicata or otherwise, give preclusive effect to findings of fact of determinations of the Director with regard to the issue necessary to determine the adequacy of the dismissal or nonreemployment of the career teacher in the trial de novo. Within three (3) days following the conclusion of the trial de novo, the judge shall prepare written findings of fact and conclusions of law and shall enter judgment directing either of the following:
I. This section shall not apply to the following: