Okla. Stat. tit. 74, § 74-174: Investigation of state eleemosynary institutions

At the request of the Governor, or with his sanction, the State

Department of Public Welfare shall investigate any state

eleemosynary institution against which complaint is made, and 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 take 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 such powers as are given to

notaries public when they are taking depositions. Evidence of

persons restrained in prisons or any other places of detention, if

deemed necessary or requested by the witness, shall be taken out of

the hearing of persons in authority about such institutions and be

preserved and kept secret, and be used only by the Department so far

as may be by him deemed necessary to correct or remedy any wrong

that is or may be disclosed.