In Illinois the new law is just a form that realtors have to provide with the contract any knowledge of radon, and the opportunity to test for radon. It is not mandatory to get a radon test.

In Illinois you have to have a license to perform radon testing or mitigation.

Home inspectors are also licensed in Illinois. So if you want to perform radon testing it means 2 license fees, 2 different sets of continuing education to maintain the license.