A mistrial is not a victory. Sorry.
He can be retried.
I suggest everyone go to that link, though, and watch the original video. It is unfortunate we don't have the initial interaction on tape, but just listen to the cops on the video.
"We are exempt from the law."
No, they're not.
I hope Mr. Grisham either gets his trial and is found not guilty or has it dismissed. THAT would be a victory.
The Professor