See also this post by greyenlightenment. There is a widespread (e.g. 1, 2, 3) but false belief that the 1970s supreme court case Griggs v. Duke Power Co., 401 U.S. 424 (1971) resulted in a de facto ban on using IQ (intelligence) or other cognitive testing in employment relations. This is not the case. Here's some semi-recent legal reviews.
IQ testing in America: not banned
IQ testing in America: not banned
IQ testing in America: not banned
See also this post by greyenlightenment. There is a widespread (e.g. 1, 2, 3) but false belief that the 1970s supreme court case Griggs v. Duke Power Co., 401 U.S. 424 (1971) resulted in a de facto ban on using IQ (intelligence) or other cognitive testing in employment relations. This is not the case. Here's some semi-recent legal reviews.