A recipient shall not administer or operate any test or other criterion for any employment opportunity which has a disproportionately adverse effect on persons on the basis of sex unless:
(a) Use of such test or other criterion is shown to predict validly successful performance in the position in question; and
(b) Alternative tests or criteria for such purpose, which do not have such disproportionately adverse effect, are shown to be unavailable. (Authority: Secs. 901, 902, Education Amendments of 1972, 86 Stat. 373, 374; 20 U.S.C. 1681, 1682)