It's a freakin JOKE post sam.....use your head for something other than keep your ears apart. jeeez
As Rod pointed out, that story has been attributed to several different areas of the country.
Now to seriously answer your question of a person shooting at a cop while arresting someone getting acquitted. It could happen, but not likely. Actually they probably wouldn't live long enough to be arrested.
The woman in the JOKE wasn't acquitted, the arraigning judge evidently felt that it was justifiable homicide.
Oh, I don't care if it was a joke or not. I'm starting to wonder what happens if some get their way and everybody is armed. A "What if,..." scenario. What are the legal ramifications and what becomes "justifiable" and not. Free your mind a little bit.