My DH and I were recently given a checklist of all sorts of DXs and behaviors and circumstances that we would allow/not allow/consider in fostering or adoptive placements. We went through the list and there ended being very little that we would not at least consider. I know that we also did the same checklist when we were starting out 2-3 years ago. At this point I have no idea exactly how I marked things, but I do know there was a lot I had never heard of, and a lot we wouldn't allow at that time. I think the more experience you get in this field, the more you come to understand and expect certain DXs. I remember being terrified of the thought of having kids with sexual abuse when I first took the classes to be a foster parent. I'm not really sure at this point why, but I think it was more having to do with visualizing this abuse taking place on these poor kids. Now I fully understand it's one of the most common abuses, and I don't think twice about it.

Don't necessarily rule out anything, unless you know you just couldn't handle it at all. I think you just find out the specific kids' DXs and just do the best to work with it, like others have posted here.