This could be required for any business that gets any sort of tax exemption, tax credit, or federal/state training money.
It would involve disability awareness training, how to integrate people with disabilities into their business, how to contact OVR or someone similar to address a potential issue (like saying a job coach is needed for a while instead of firing them), and how to avoid "silent" discrimination against those with disabilities.
Many times people have underlying prejudices that they may not even realize they have that makes the person with a disability lose out on job opportunities. When 80+% of people with a psychosocial disability get rejected for new jobs because of a negative, false stereotype their potential employer had, it demonstrates how severe the issue is.
By tying the required training with federal OR state/local favors, this sort of training can be mandated by virtually every medium to large employer in the nation.