Evidence backing up the claim that Bergdahl VOLUNTARILY left the US forces to join the Taliban may not even be introduced at the trial. This, I believe, is a mistake.
Apparently, the government feels that the case is so strong that the tapes aren't needed. However, I believe that failure to include them - and drive a nail in the coffin of conviction - will lead to yet another obvious case that the Leftists/Progressives will use to lead the charge of "false conviction".
And, we've seen too many of those Hiss/Rosenberg trials that the Left is STILL insisting is due to an overreaching, diabolical government conspiracy to hang perfectly innocent victims. Which they will use to raise funds.