The prosecutor actually has a duty to prosecute these kinds of crimes if they believe that there's enough evidence. That the wife was released from jail doesn't

The prosecutor actually has a duty to prosecute these kinds of crimes if they believe that there's enough evidence. That the wife was released from jail doesn't mean that there won't be a prosecution. I can maybe understand the prosecutor if the small bottle was KCl, because then there's no way to prove that the wife was the one who also introduced the vitamin D. It's obvious that it was, but I don't see how one could prove it to the level required by a court.