The Federal Communications Commission certifies persons operating and repairing amateur and many (depending on their power and frequencies) commercial radio transmitters.
In many of these areas the federal government approves organizations (and for the FAA designated pilot examiners) to test and certify applicants who meet its standards.
Among regulated fields are health care professionals (medical doctors, nurses); psychologists; lawyers; teachers; engineers; social workers; occupational therapists; architects; tradesmen (plumbers, electricians); certain service industry workers (bartenders, massage therapists, barbers); and accounting professionals (CPA),[2][3] among others.
[5] On the other hand, there are states which do not license potentially dangerous professions such as radiologic technicians, despite their delivering ionizing radiation to the general public.
Individuals' ability to receive state or local public benefits, which includes professional and commercial licensure, is dependent on their particular immigration status.