We had a guy in AZ do a drive-by of a speed camera van with a .45 handgun, a couple years ago.
He ended up killing the tech that was inside the van, although he thought it only had electronic equipment in it and was otherwise unmanned. Can't remember if he got manslaughter or actual murder at the trial.
What's scary about that, is I was coming home from teaching an Appleseed that Sunday evening and passed that same camera within about 5 minutes of the shooting. I'd been a hugely outspoken critic of the cameras, and had a .45 in the truck with me as I drove by.