Okla. Admin. Code § 612:1-15-1
The manual of the Department of Rehabilitation Services represents: the official statement regarding the function and organization of the Department; the policies established by the Oklahoma Commission for Rehabilitation Services to implement the Federal and State laws relating to the Department; and the procedures adopted by administrative action which are to be uniformly followed throughout the Department, both in relation to the Department's programs and in regard to the staff members' relationship with the Department as an employer. It serves as an authority and guide to staff members administering the various programs. The administrative rules in this Chapter are promulgated under the authority of the Commission for Rehabilitation Services as established in 74 O.S., Section 166.1 et seq and the Administrative Procedures Act, 75 O.S., Sections 250 et seq.
Okla. Admin. Code § 612:1-15-1