Alabama
Arkansas
Illinois
Indiana
Iowa
Kentucky
Louisiana
Maine
Massachusetts
Michigan
Mississippi
Missouri (only needed in St. Louis County)
Nebraska
Nevada
New Mexico
New York (only needed in Erie & Suffolk Counties)
North Carolina
North Dakota
Oklahoma
Oregon
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
West Virginia
States that DO NOT license polygraph examiners:
Alaska
Arizona
California
Colorado
Connecticut
Delaware
DC
Florida
Georgia
Hawaii
Idaho
Kansas
Maryland
Minnesota
Missouri (but one county requires a license: St. Louis)
Montana
New Hampshire
New Jersey
New York (but two counties require a license: Erie & Suffolk)
Ohio
Pennsylvania
Rhode Island
Washington
Wisconsin
Wyoming