Okla. Stat. tit. 56 § 162.4
The Director of the Department of Human Services shall have the authority to commission certified employees within the Office of the Inspector General of the Department as peace officers. The authority of employees so commissioned shall include the authority to investigate crimes committed against the Department or crimes committed in the course of any program administered by the Department and the authority to investigate cases of Medicaid recipient fraud. Employees so commissioned shall also have the authority to serve and execute process, bench warrants and other court orders in any judicial or administrative proceeding in which the Department is a party or participant. Use and possession of firearms shall be at the discretion of the Director of the Department of Human Services, for the fraud unit only. To become qualified as peace officers for the commission, employees shall first obtain a certificate as provided for in Section 3311 of Title 70 of the Oklahoma Statutes.
Okla. Stat. tit. 56, § 162.4