38 CFR §18.413

1. (a)A recipient may not use 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 that do not screen out or tend to screen out as many handicapped persons are not shown by the Secretary to be available.
2. (b)A recipient shall select and administer tests concerning employment to best 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 whatever other factor the test purports to measure, rather than reflect the applicant's or employee's impaired sensory, manual, or speaking skills (except when those skills are the factors that the test purports to measure).