Okla. Stat. tit. 22, § 22-333: Evidence before grand jury

In the investigation of a charge for the purpose of presenting

an indictment or accusation, the grand jury may receive the written

testimony of the witnesses taken in a preliminary examination of the

same charge, and also the sworn testimony prepared by the district

attorney without bringing those witnesses before them, and may hear

evidence given by witnesses produced and sworn before them, and may

also receive legal documentary evidence. Each indictment or

accusation shall be voted on separately by the grand jury.