Is running my credit legitimate or can I file charges against him for doing this?

I have an ex brother in law who is a cop in NJ. My sister and him had a bad divorce due to him having an affair and leaving for a new family. Issue is that he has been running my credit and has my social security information, not sure how but every so often I get to find out that he runs it and checks up on me, my daughter, husband and sister. I am very upset and don't think this should be legal without person's consent.