IQ tests are legal to the extent that they apply to the job at-hand. From the Civil Rights Act: > nor shall it be an unlawful employment practice for an employ

IQ tests are legal to the extent that they apply to the job at-hand. From the Civil Rights Act: > nor shall it be an unlawful employment practice for an employer to give and to act upon the results of any professionally developed ability test provided that such test, its administration or action upon the results is not designed, intended or used to discriminate because of race, color, religion, sex or national origin https://www.eeoc.gov/statutes/title-vii-civil-rights-act-1964 https://www.eeoc.gov/statutes/title-vii-civil-rights-act-196... Though understandably, a lot of people in the United States see this as a risky heuristic given the IQ test's history as a discriminator of race and national origin.