It doesn't usually stay like this - though I guess it could. With my AD, the belligerence , the anger, and the constant blaming lasted only about a year. then she really did realize she had a drug problem, and it wasn't as bad. There are still lies, rationalizations, etc, but not so much anger. It's all part of their process - at first its really totally essential for them to justify everything in order to keep using and in order to not look at any problems they or their using is causing. crummy disease.
Fortunately for you and your family, the courts are pretty jaded and have heard it all!