Ala. Code § 2-9-5
The salaries and expenses of the commissioner, members of the State Board of Agriculture and Industries, and the salaries of the employees of the Department of Agriculture and Industries, as otherwise fixed by law, shall be payable from the Agricultural Fund and other funds available to said department by legislative appropriation or otherwise; provided, that the expenses of travel and type or means of transportation of such officers and employees and other expenses incident thereto in the performance of their official duties, as otherwise provided by law, and proof thereof, shall be subject to rules and regulations approved by the State Board of Agriculture and Industries as to the manner, method or system of payment. The provisions of this section as to expenses shall also apply to experts and scientists when performing duties as provided in this title or any other provision of this Code or other statute which the Commissioner, Department or Board of Agriculture and Industries is authorized or directed to administer or enforce.
Ala. Code § 2-9-5 (1975)