Except as otherwise provided by this Code, the district attorney shall prepare and prosecute every hearing and proceeding within the purview of the Oklahoma Children's Code, and shall act as petitioner in all cases; provided, counsel for the Department of Human Services may, with consent of the district attorney, represent the interests of the state in proceedings involving a child in the permanent legal custody of the Department.
Okla. Stat. tit. 10A, § 1-4-501