Okla. Stat. tit. 22, § 22-315: Grounds for challenge to juror

A challenge to an individual grand juror may be interposed by

either party, for one or more of the following causes only:

1. That he is a minor.

2. That he is not a qualified elector.

3. That he is otherwise disqualified under any of the

provisions of law, in relation to the qualification of grand jurors.

4. That he is insane.

5. That he is a prosecutor upon a charge against the defendant.

6. That he is a witness on the part of the prosecution and has

been served with process by an undertaking as such.

7. That a state of mind exists on his part in reference to the

case, or to either party, which will prevent him from acting

impartially and without prejudice to the substantial rights of the

party challenging; but no person shall be disqualified as a grand

juror, by reason of having formed and expressed an opinion upon the

matter or cause to be submitted to such jury, founded upon public

rumor, statements in public journals, or common notoriety, provided

it satisfactorily appear to the court, upon his declaration, under

oath, or otherwise, that he can and will, notwithstanding such

opinion, act impartially and fairly upon the matters to be submitted

to him.