Leaks from Members (or sometimes military judges) occasionally give rise to appellate litigation.
Here is an interesting piece on federal evidence review:
Motion for new trial on criminal extortion and bribery case denied, despite juror’s statement to newspaper after the verdict that because the defendants did not testify, the juror reasoned that "[if] they were innocent, they would have testified.’”; since members of the jury did not learn of the defendant’s failure to testify through improper channels, the evidence of their discussions was not admissible under FRE 606(b) as it was not an extrinsic influence, inUnited States v. Kelley, 461 F.3d 817 (6th Cir. Aug. 31, 2006) (Nos. 05-1361, 05-1435)