Immigration authorities are fully aware this is happening? If that is the case, then I would challenge all illegal officers to tell the US immigration guy that they are coming to the US to work.
If CX has a US business license, then they have to follow US rules. Even if they base people in the USA without a US business license - CX still has to follow the law. This is a waste of the AOAC's funds, as they do not have the ability to circumvent laws.