Miss. Code Ann. § 13-7-19: Miss. Code Ann. § 13-7-19

After the state grand jurors shall have been sworn and impaneled, no objections shall be raised by plea or otherwise, to the state grand jury, but the impaneling of the state grand jury shall be conclusive evidence of its competency and qualifications. However, any party interested may challenge the jury, except to the array, for fraud.