dr. barbara l. kornblau, j.d., disabilities attorney and professor, school of health professions and studies, university of michigan-flint, flint, michigan. ed hammett, consumer advocate, marbury, maryland. dr. clark, how many people in the united states have a disability? that number is not exactly clear, but we estimate roughly 53 million people have a disability, and it may be larger because, again, it turns on new classification schema. but at least 53 million. john, how do we define a disability? well, a disability is really kind of a legal and an administrative term. and in some quarters you might be considered disabled, but by another jurisdiction you might not be considered disabled. but i use the term, often, physical sensory, cognitive, and developmental disability to really clarify what we're talking about. so, barbara, in terms of a real sense, so there are individuals who may have had accidents are now paraplegic, quadriplegic- in terms of those with a substance use or mental illness, are they c