It shall be unlawful for any officer, employee, agent, or former employee or agent of the Department of Revenue to use a federal tax return, or information reflected on such federal return, for any purpose other than in the administration of the revenue laws administered by the Department of Revenue or to disclose to any person, except as authorized by the Internal Revenue Code, 26 U.S.C. §1 et seq., any federal return information, whether received from the Internal Revenue Service under an exchange of information agreement or from the taxpayer as an attachment to his state tax return. Any person violating the provisions of this section shall be deemed guilty of a misdemeanor, and shall be fined not to exceed $1,000 or sentenced to hard labor for the county for not more than one year, one or both for each offense, and upon conviction thereof, any such person shall thereafter be ineligible to hold the office of commissioner or become or be an employee or agent of the Department of Revenue or under the Department of Revenue.