Example 1: Professions requiring licensure or certification States vary in the professions and trades they regulate. The following is a list culled from the certification boards of a number of states, including Connecticut, Massachusetts, Virginia, and others. The list could easily be more than three times as long as it is. Acupuncturists Architects Barbers Chiropractors Cosmetologists Dentists and Hygienists Dietitians Electricians EMT's and Paramedics Engineers Funeral Directors and Embalmers Hearing Instrument Specialists Home Inspectors Lawyers Nurses and Nurses' Aides Opticians Optometrists Pharmacists Physicians and Psychiatrists Plumbers and Gas Fitters Psychologists Public Accountants Radio/TV Technicians Real Estate Brokers and Salespersons Social Workers Speech Pathologists Teachers and School Principals Contributor Phil Rabinowitz