Is regarded as having an impairment
(4) Is regarded as having an impairment means (i) Has a physical or mental impairment that does not substantially limit major life activities but is treated by the agency as constituting such a limitation; (ii) Has a physical or mental impairment that substantially limits major life activities only as a result of the attitudes of others toward such impairment; or (iii) Has none of the impairments defined in paragraph (1) of this definition but is treated by the agency as having such an impairment.