Substitute panel members during ongoing courts-martial are governed by RCM 912a, which permits replacement before deliberations begin for good cause. Common reasons include member illness, emergency leave, or disqualification after trial commencement. The military judge must ensure substitutes receive equivalent information as excused members, typically through transcript review or stipulated summaries. New members must affirm ability to decide based solely on evidence presented.
Timing restrictions prevent substitutions after deliberations commence to protect deliberative process integrity. The accused must consent to proceed with substituted panels or may request mistrial. Strategic considerations include whether partial retrial benefits outweigh continuing with substitutes. Panels must maintain minimum statutory numbers – five for general courts-martial or three for special courts-martial.
Practical challenges include substitute availability and bringing new members current on proceedings. Reading extensive transcripts may prove inadequate for assessing witness credibility. Video recordings of testimony provide better substitution mechanisms. The military judge carefully instructs substituted panels about considering only properly admitted evidence. Both parties may request brief reopening for key witness examination before substituted members. The balance maintains trial efficiency while protecting fair trial rights despite member changes. Adequate alternate member detailing prevents most mid-trial substitution needs.