Okla. Stat. tit. 51, § 51-63: Fees for witnesses and executions of processes

Witnesses shall have the same compensation for travel and

attendance, and the same exemptions in going, remaining and

returning, as witnesses in the district court; and officers

executing the process and orders of the Senate when sitting as a

court of impeachment shall have the same fees as are allowed

sheriffs for like services in the district court.