It is almost certainly legal to hire based on assessments of intelligence. If I insisted in a job interview that 4+9=12, the moon is simply a sky-reflection of the lights from Manhattan, and that I can’t stand to be in the same room as tall people since they affect gravity in disturbing ways, you would draw conclusions about my intelligence. Would you then avoid hiring me?
IQ tests might be illegal under some circumstances, but I would point out that they are not a reliable measure of intelligence anyways, making this all a bit of a moot point.
IQ tests might be illegal under some circumstances, but I would point out that they are not a reliable measure of intelligence anyways, making this all a bit of a moot point.