Administrative agencies are created by the state legislature, exist under the executive branch, and are empowered by their enabling legislation to regulate their area. Agencies include the Department of Human Services, the Oklahoma Board of Dentistry, and Alcholic Beverage Laws Enforcement Commission. See the set for a full listing.
The Oklahoma Administrative Code (updated by the Oklahoma Register) is a compilation of all the regulations issued by Oklahoma agencies as well as executive orders. Please note - this set was last completely published in 2006. After 2006 there are yearly cumulative supplements (2007, 2008, etc.). The online (unofficial) version is probably easier to search: http://www.oar.state.ok.us/
* Pick a volume of the 2006 set and browse the table of contents for a complete list of Titles, then find the volume in which that title appears and read the table of contents until you find a relevant section; or
* Use the Oklahoma Statutes Annotated to find which statute created the agency, and find a cross reference to bring you back to the Oklahoma Administrative Code.
The most current complete set was published in 2006. To find sections after 2006:
Find the most recent supplement volumes (2009 as of this writing).
The last supplement volume will have an index - use that index to see if there have been any changes in your section.