EDIT: my parent edited and replaced their entire comment, it originally said "you can't use IQ tests even if you prove they lead to better job performance". I l

EDIT: my parent edited and replaced their entire comment, it originally said "you can't use IQ tests even if you prove they lead to better job performance". I leave my original comment below for posterity: This is not true, IQ tests in the mentioned Griggs v. Duke Power Co. (and similar cases) were rejected as disparate impact specifically because the company provided no evidence they lead to better performance. To quote the majority opinion of Griggs: > On the record before us, neither the high school completion requirement nor the general intelligence test is shown to bear a demonstrable relationship to successful performance of the jobs for which it was used. Both were adopted, as the Court of Appeals noted, without meaningful study of their relationship to job performance ability.