Domestic violence and substance abuse seem to go hand in hand, but does substance abuse cause domestic violence? This is a question many law enforcement officers would affirm as true.
While houses where there is no domestic abuse will by definition not have cops come there for that reason, it goes without saying that substance abuse still occurs at some of these houses.
However when law enforcement is called for domestic abuse there is almost always substance abuse, estimated at 80% or more from my sources.
I cannot cite studies or other evidence as livewyered did (excellent job BTW), I can cite 2 close friends who are cops, and 1 cop who is in my AA home group. You'll never convince them that these problems are not linked.