As I thought, the DOJ can’t just drop the case; rather the judge must consent which is hwy the DOJ has filed a motion for dismissal: https://www.foxnews.com/politics/read-dojs-motion-to-dismiss-charges-against-michael-flynn
Read the motion. Its pretty damning.
The prosecutor resigned because of his “criminal” activity. If the judge wants to deny the DOJ’s request then the judge’s move will be subject to an appeal’s court. He’s sunk. Get out while he can.