Roy,
I could go both ways on this. What if you knew that a student had a significant learning disability and in the back of your head you thought "there is no way this student can be successful, make it through this program and get a job"? Do you think that could perhaps impact (maybe on a subconscious level) how you work with that student? Unfortunately, that could be the case with some faculty-they give up on a student before the student ever steps foot in the class.
Sarah Smoger