The following employers may require that an applicant for employment take or submit to a polygraph examination, or administer or cause to be administered a polygraph examination to an applicant for employment:
(1) the Department of Public Safety; the Department of Motor Vehicles, for applicants for law enforcement positions; the Department of Fish and Wildlife, for applicants for law enforcement positions; the Department of Liquor and Lottery and the Board of Liquor and Lottery, for applicants for investigator positions; municipal police departments and county sheriffs, as to sworn police officers and deputy sheriffs;
(2) any employer whose primary business is the wholesale or retail sale of precious metals or gems and jewelry or items made from precious metals or gems;
(3) any employer whose business includes the manufacture or the wholesale or retail sale of regulated drugs as defined in 18 V.S.A. § 4201; provided, however, that only employees who come in contact with such regulated drugs may be required to take a polygraph examination;
(4) any employer authorized or required under federal law or regulations to administer polygraph examinations.