In general most states enforce laws related to domestic violence very strenuously. You don't say if there was actual violence involved as opposed to a verbal dispute. Even so if the verbal dispute was loud and abusive it may come within the scope of your state's DV laws. I do not see any mistakes by the police officers in your narrative. They didn't have to read your husband his rights unless they were going to interrogate him in custody. Inconsistencies in your statements to police are more your problem than theirs. Depending on the facts you may convince the prosecutor to lower the charges to simple assault or disturbing the peace but you'd best hire a lawyer to do that.