Okla. Stat. tit. 22, § 22-338: Subjects for inquiry by grand jury

The grand jury must inquire:

1. Into the case of every person imprisoned in the jail of the

county or subdivision, on a criminal charge, and not indicted.

2. Into the condition and management of the public prisons in

the county or subdivision; and,

3. Into the willful and corrupt misconduct in office of public

officers of every description in the county or subdivision.