here's a link [https://www.eeoc.gov/laws/statutes/ada.cfm](https://www.eeoc.gov/laws/statutes/ada.cfm) ​ Go to "definition of disability", I think it falls under " (A) a physical or mental impairment that substantially limits one or more major life activities of such individual; ". Then go below 2 (A) --- it mentions communication as a major life activity. ​ I think there is a better link then the one I provided, but it was Title I under the 1990 Disability Act.