I don't know where to tell you to look, but I can offer you this tidbit -- one problem is that you often get multiple conflicting diagnoses for the same subject, based on the subject's symptoms and the criteria in the book.
That is correct. I heard about some studies like that..done on prison inmates. Some inmates were supposedly NOT mentally ill but yet were diagnosed with an illness and visa versa. The little con artists... (not just the inmates either)
I've always kinda wondered how many people I could diagnose to have Tourette's Disorder. I'm certain I do.