Sara,
You have identified the sticking point, but also the hope. The student, because of disability, may not be able to practice within the field in the TYPICAL way, but if he/she has all the education and background, there may be nontraditional ways to put that education and information to use. Look at all the jobs that people have today that didn't exist 10 years ago, but have been brought about by advances in technology!
Dr. Jane Jarrow