States can prohibit state and local agencies from buying and/or using DJI drones.
Federal can prohibit federal government agency from buying and/or using DJI drones and to a certain degree, they can influence and impact state and local agencies as well.
Only the US government can prohibit the public from operating DJI drones in the US airspace but so far this has not happened. Depending on how it is worded, this would be called a "ban" although it is unlikely to prohibit buying or owning or possessing a DJI drone.
As of now, there is no ban. The American people don't consider government agencies telling each other what to do and what not to do, and fighting among themselves....a ban; we call it nonsense but they do it all the time.
Unfortunately, we aren't doing much to prevent a future ban because we aren't taking it seriously. We say there is no evidence which is a weak argument; just because we have no evidence doesn't mean it doesn't exist somewhere or it can't be manufactured. Ultimately we'll get banned one day and then we'll spend the rest of our years trying to get unbanned because we act like this is the first time the government has done something ridiculous like this. We believe we have the truth and the facts on our side and common sense will prevail and that will save us. Slowly but surely the count gets closer to 50 states taking adverse actions and literally thousands of local agencies including cities and counties and regulatory agencies and even home owners associations. Every week another group proposes another law and if it fails, they propose another one. They are coming for us with both barrels and they're going to eat our lunch because we're not ready where we need to be, in the courtrooms not in the legislature (which is a lost cause). All it will take is one incident with China and you won't even be able to speak up on behalf of the hobby.
Fly freely now and enjoy while you still can.