I honestly cannot comprehend why shareholders would sell based on the premise the attorney general MIGHT ban the drug. Really? Do they not realize how many opiates are out there and that a fair market would demand all of those drugs be banned as well. It would be a blatant case of selecting a market. Will not know it because despite the government's faults, they know a decision like that could be very costly and embarrassing for them.
Also, go back to the FDA's approval decision and their reasoning for dismissing the panel's earlier opinion to not approve the drug. They HAD to approve it because of the reasons stated above.