No materials designed to influence the results of an election for state office or a state question shall be posted in the state capitol building or in any office or other space owned, leased or occupied by the State of Oklahoma that ordinarily is used for the conduct of official state business, except as permitted by law or these Rules. Provided, however, such materials may be posted for a reasonable period of time when state facilities are being used for political purposes as provided in these Rules.
Okla. Stat. tit. 74E, § 2.7