Earlier quoted context omitted.
Maybe talk to your lawyer or HR person before using IQ tests tho.
Elaborate? These tests are pretty common in interviews. I'd be curious to know what you're thinking.
In the US, IQ tests are not illegal per se, but they're considered difficult to justify. The courts have adopted a disparate impact criteria -- anything with disparate impact requires a justification. Unfortunate as it is, some minority groups score lower on IQ tests, and it's up to the employer to justify whatever cutoff they choose to use. If you use a cutoff of 115, and someone comes along with a 114, it'll be difficult to argue before a judge that the additional IQ point was not just better for job performance, but necessary. As this applies to any number you pick, there's a certain slippery slope to IQ testing candidates at all.
In contrast, a degree in a relevant field is a very yes/no answer, even if the disparate impact is greater.