Okla. Stat. tit. 10, § 10-418: Authority to obtain evidence - Administration of oaths

When conducting investigations of complaints as provided in this

article, the Department of Public Welfare shall have the power to

summon any person to appear and produce such books and papers as

shall be designated in the summons, and to give testimony under oath

concerning the matter and institution under investigation. The

Department shall have the power to administer oaths to such persons

as may be summoned and to enforce all such powers as are given to

notaries public when they are taking depositions.