Okla. Stat. tit. 38, § 21
If a grand jury is ordered, the number stated in the judge's order, not to exceed one hundred, shall be summoned as grand jurors, and the grand jury shall be impaneled from said persons. The judge of the district court shall order the court clerk or one of his or her deputies to order the stated number of jurors from the Administrative Director of the Courts. In addition to the twelve (12) grand jurors to be impaneled, three additional persons shall be selected as alternate grand jurors. The alternate grand jurors shall attend all functions of the grand jury during its term and shall be subject to all laws governing grand jurors. Provided that, no alternate juror shall participate in any deliberations of the grand jury until appointed to fill a vacancy. If the judge so directs, the persons summoned for the grand jury panel who are not used thereon may be transferred to the petit jury panel. Additional and other drawing of as many names as the court may order may be had at any such time as the court or judge may order for the completion of a grand or petit jury panel, or for the impaneling of a new grand or petit jury if, in the judgment of the court, the same shall be necessary, or if, for any cause, the court, in its discretion, shall deem other jurors necessary. The court may excuse or discharge any person drawn and summoned as a grand or petit juror, whenever, in its discretion, such action shall be deemed expedient. No person may be required to render service as a petit juror for more than a total of eighteen (18) days in any one calendar year unless, when this time limit is reached, he or she is sitting upon a panel engaged in the consideration of a case, in which event he or she may be excused when such case is terminated; provided, that if the judge is of the opinion that the jury business of a term fixed by the court may be concluded within six (6) days, the judge may require a petit jury, or a petit juror, to remain until the termination of such jury service. Persons summoned for petit jury service need not be required to serve during previously fixed days or weeks or a term fixed by the court for jury trials, but they may be recalled from time to time as the trial needs of the district court may require, without regard to the term fixed by the court for jury trials for which they were originally summoned.
Laws 1949, SB 155, p. 280, § 4, emerg. eff. June 2, 1949; Amended by Laws 1961, HB 504, p. 281, § 1; Amended by Laws 1963, HB 546, c. 268, § 1; Amended by Laws 1969, SB 15, c. 134, § 1, emerg. eff. April 9, 1969; Amended by Laws 1975, HB 1585, c. 310, § 1, eff. October 1, 1975; Amended by Laws 1977, HB 1401, c. 213, § 2, emerg. eff. June 14, 1977; Amended by Laws 1982, HB 1491, c. 3, § 1; Amended by Laws 2002, SB 1458, c. 390, § 17, emerg. eff. June 4, 2002 (superseded document available).