I don't understand it. Any half way on the ball prosecutor will pick up on the withheld data and bring it up on cross and the expert can sit there looking as if he has been hoodwinked by the defense and the jury can see the expert's reactions and answers as a result of the 'new' evidence and think, like I do, that the defense atty is a unethical and by default the person who hired him to represent him is capable of same behavior. This is who the defendant chose to represent him. A fellow scoundrel.
BBM......LOL and the defense attorney plays that part perfectly.....even dresses perfectly for a scoundrel in a movie complete with shoes!