You need to be more specific. It depends on what the special needs are and what the allowances or accommodations are. For instance, I have students that are registered with Disability Services and we usually work together to come up with accommodations that allow the student to participate in the course. However, there have been a few times when the students' abilities simply are not compatible with the course requirements, even with reasonable accommodations. In those instances, I have to help the student register for an alternate course. I would assume the same kind of thing might apply to therapy. For instance, a client on the Autism spectrum may need certain accommodations in order to participate in DBT or CBT, and the T can find a reasonable way to make that work. On the other hand, another client with more severe disabilities may not be able to participate in a CBT group, even with some accommodations, because it may be too disruptive to the rest of the group. I don't think this is a yes or no question.