Keep documented records of any physical altercations... pics too if you can.. if you can establish a pattern of behavior, that will work for you....
Also,IMPORTANT: go get a copy of the police report and see what was written. What happens, whats reported and what goes on paper can be in 3 totally different things..
I would expect the report was accurate as you described AND, having the report in hand (and subsequent others) will bolster your claims in court of law...
I had my own episode of W being BAT [censored] CRAZY (nod to Robx).. he suggested what ever I expected, take it to a factor of 10, then you'll be prepared... I saw it first hand.