Section II-18: Grand jury.

    A grand jury shall be composed of twelve (12) persons, any nine
(9) of whom concurring may find an indictment or true bill.  A grand
jury shall be convened upon the order of a district judge upon his
own motion; or such grand jury shall be ordered by a district judge
upon the filing of a petition therefor signed by qualified electors
of the county equal to the number of signatures required to propose
legislation by a county by initiative petition as provided in Section
5 of Article V of the Oklahoma Constitution, with the minimum number
of required signatures being five hundred (500) and the maximum being
five thousand (5,000); and further providing that in any calendar
year in which a grand jury has been convened pursuant to a petition
therefor, then any subsequent petition filed during the same calendar
year shall require double the minimum number of signatures as were
required hereunder for the first petition; or such grand jury shall
be ordered convened upon the filing of a verified application by the
Attorney General of the State of Oklahoma who shall have authority to
conduct the grand jury in investigating crimes which are alleged to
have been committed in said county or involving multicounty criminal
activities; when so assembled such grand jury shall have power to
inquire into and return indictments for all character and grades of
crime.  All other provisions of the Constitution or the laws of this
state in conflict with the provisions of this constitutional
amendment are hereby expressly repealed.
    The Legislature shall enact laws to prevent corruption in making,
filing, circulating and submitting petitions calling for convening a
grand jury.