A person is not competent to act as juror: (1) who does not possess the qualifications prescribed by 3-15-301; or (2) who has been convicted of malfeasance in office or any felony or other high crime.
Who Not Competent
Mont. Code Ann. § 3-15-303, under Jurors -- Competency and Excuses.
Mont. Code Ann. § 3-15-303