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 Washington DC Wisconsin Wyoming