Mo. Rev. Stat. § 540.045: Qualifications and exemptions from service.

1. The provisions of sections 494.400 to 494.505 relating to the qualifications and disqualifications of petit jurors and exemptions from service as a petit juror are applicable to grand jurors drawn and selected under the provisions of this chapter.

2. In addition thereto, any person who has served as a member or alternate of a grand jury, or alternate, within ten years next preceding his selection shall not be eligible for service as a grand juror.