The WHY part is easy: If the prosecution tampered with evidence, then JA most likely walks free.
The HOW part is more challenging, especially after both sides have had a shot at it. Whatever one of KN's fleet of




experts can say, JM will have some expert who can rip it apart. Most likely it comes back to JA planting it as part of her premeditation, so it could backfire.
This could well backfire, but I'm willing to bet at this point that he will demand the trial be halted until they can hold hearings over whether this can be entered as evidence - of course he'll need more time for that first - and for JSS to make a ruling before the penalty phase continues. I wouldn't be at all surprised if Thanksgiving passes before another witness testifies in penalty phase II. He only needs to get 5 more jurors to bail when they realize they are going to be on the hook well past Christmas....