He’s an ME who testifies on the facts. He can have any opinion, but he’s no longer an ME. He’s just the same as you or I when he states such nonsense. The persecutors are grasping at straws.
I guess today was the ‘emotional testimony day’ for the state. Then they close their case and await the defense witnesses next week.
I find it rather insulting, but hey, I’m not on the jury.