45 CFR §1170.23

1. (a)A recipient may not make use of any employment test or other selection criterion that screens out or tends to screen out handicapped persons or any class of handicapped persons unless:
   1. (1)The test score or other selection criterion, as used by the recipient, is shown to be job-related for the position in question; and
   2. (2)Alternative job-related tests or criteria are unavailable.
2. (b)A recipient shall select and administer tests concerning employment so as best to ensure that, when administered to an applicant or employee who has a handicap that impairs sensory, manual, or speaking skills, the test results accurately reflect the applicant's or employee's job skills, aptitude, or other factors relevant to adequate performance of the job in question.