I think adoption would be a great topic to research, because laws are always changing, and there are some aspects of it that are somewhat controversial. Adoption would be a good topic to choose because you can interview parents of adopted children, and children who are adopted and find out their opinions on the subject, to get a few different angles on it. I dont really know of any alternate sources that offer information about adoption, but if you do for some reason decide to change your focus to the "Mental Health Institutions in Movies" topic, One Flew Over The Cuckoo's Nest is a great movie, and I've heard its also a really good book.