This subchapter shall be cumulative to the laws in force relating to the functions and duties imposed upon the Department of Arkansas State Police and its successor entities under the provisions of Acts 1953, No. 122, and acts amendatory thereto. It shall also be cumulative to laws in effect that were in effect prior to the enactment of Acts 1953, No. 122, which imposed duties upon the Arkansas Department of Transportation and the Director of the Department of Finance and Administration, as well as their successor entities and officials, which were transferred to the Department of Arkansas State Police under the provisions of Acts 1953, No. 122, as amended.