I am firmly of the belief (but can't lay my hands on the stats just now) that personality disorders and substance abuse are very firmly linked and my hunch is that it is the disorder that comes first, which I know is very un-12 Step of me. So often this aspect is unconsidered, both by professionals and loved ones which is a crying shame, although the problem is compounded by the whole diagnosis issue. We are always told that we can't diagnose another, especially if we are not qualified, however I could hazard a guess that every last one of us are better qualified in life terms to make a guess that may just save our sanity. Even if someone with a PD ever enters the rooms of a qualified person, they are highly unlikely to display evidence of their disorder and are even less likely to respond to treatment. That is the nature of personality disorders, unfortunatelt.
There is loads of info and forums on the net regarding PDs, if any of you want a supplement to SR.