Okla. Stat. tit. 57, § 552

The Department Classification Committee shall have the authority to refer inmates, upon reception, to the Pardon and Parole Board under written rules and regulations governing such referrals promulgated by said Board. The Department Classification Committee shall seek to recommend prisoners requiring alcoholism treatment services to alcoholism treatment centers as a condition of a medical leave or parole. If a prisoner requiring such services is indigent, such services shall be provided by the Department of Mental Health and Substance Abuse Services.