Okla. Admin. Code § 612:1-1-3
The Department of Rehabilitation Services (DRS) provides services to persons with disabilities who may have the ability to pursue employment, education to children who are deaf and/or blind, and those who, due to the severity of their disabilities, may benefit in terms of increased participation in the family or community. DRS also determines eligibility for Social Security Disability Insurance (SSDI) and Supplemental Security Income (SSI) through its Disability Determination Services. Services are arranged through resources available in the community, or provided through DRS resources. All services provided must be appropriate, timely, and provided in an economical and efficient manner within the framework of federal and state laws, the State Plan, and the administrative rules and procedures issued by the Department of Rehabilitation Services.
Okla. Admin. Code § 612:1-1-3