Montana Title 25. Civil Procedure § 25-7-223. Challenges to jurors for cause

(1) a want of any of the qualifications prescribed by this code to render a person competent as a juror;

(2) being the spouse of or related to a party by consanguinity or affinity within the sixth degree;

(3) standing in the relation of guardian and ward, debtor and creditor, employer and employee, or principal and agent to either party or being a partner in business with either party or surety on any bond or obligation for either party. However, a challenge for cause may not be taken because of debtor and creditor relation when the same arises solely:

(4) having served as a juror or been a witness on a previous trial between the same parties for the same cause of action;

(5) interest on the part of the juror in the event of the action or in the main question involved in the action, except the juror's interest as a member or citizen of a municipal corporation;

(6) having an unqualified opinion or belief as to the merits of the action;

(7) the existence of a state of mind in the juror evincing enmity against or bias in favor of either party.