Not necessarily so.  My former spouse's aunty smacked me in the head with a frying pan once because as she put it "I don't like you".  I was like "dam woman, what's up with that?"  She told me she already called 911 and told the operator that I was attacking her and choking her so she hit me. (I wasn't).  Several officers arrived.  She told them all kinds of irrelevant stuff (I was shacking up with her niece, I was the wrong race, I don't take out the trash, etc.). I didn't say much other than to give the officers my ID and answered some basic questions (do you live here?, do you need medical attention? etc.).  I didn't volunteer any info and basically just cooperated with the officers the best I could. 

About 10 minutes later, aunty was screaming for her husband saying "they're taking me in!'  SHE got arrested and charged with assault.  She eventually plead out and got a year probation and paid a fine.