Hall's biggest problem, IMO, is the issue of public trust. Fairly or unfairly, he's the ogre at this point in the story. New facts may come out to change that, and the THP has yet to receive the same scrutiny.
Despite all that, I'm guessing his career in law enforcement is over. He shot an innocent family's pet dog and it's been seen on tape all over the US.
That is going to be very difficult to overcome.
It's a worldwide story. If anything, the international press is even more down on the shooting. The U.S. press feeds at the police PR trough too much.