Okla. Stat. tit. 47, § 47-2-115: Department may summon witnesses and take testimony

(a) The Commissioner and officers of the Department designated

by him shall have authority to summon witnesses to give testimony

under oath or to give written deposition upon any matter under the

jurisdiction of the Department. Such summons may require the

production of relevant books, papers and records.

(b) Every such summons shall be served at least five (5) days

before the return date, either by personal service made by any

person over eighteen (18) years of age or by registered mail, but

return acknowledgement is required to prove such latter service.

Failure to obey such a summons so served shall constitute a

misdemeanor. The fees for the attendance and travel of witnesses

shall be the same as for witnesses before the district court and

shall be paid from the Public Safety Fund.

(c) The district court, where not otherwise provided, shall have

jurisdiction, upon application by the Commissioner, to enforce all

lawful orders of the Commissioner under this section.