What, if anything, can you as military defense counsel do if you suspect some shenanigans during panel member deliberations?
Military Rule of Evidence 606 states the basic rule against questioning the panel members during or after the trial about what went on during deliberations.
Prohibited Testimony or Other Evidence. During an inquiry into the validity of a finding or sentence, a member of a court-martial may not testify about any statement made or incident that occurred during the deliberations of that court-martial; the effect of anything on that member’s or another member’s vote; or any member’s mental processes concerning the finding or sentence. The military judge may not receive a member’s affidavit or evidence of a member’s statement on these matters.