Ala. Code § 37-2-42

Any person, firm or corporation may submit to the commission, by mail or in person, any transportation company expense bill or receipt, showing charges paid for transportation of any property by freight or express for the purpose of having the same examined with respect to the correctness of weights, rates, and charges indicated thereon. Upon receipt of any such expense bill or receipt, the commission shall make such examination as is necessary, and if it shall be found that any such weights, rates or charges are incorrect, the commission shall order the transportation company in error to refund to the person, firm or corporation which submitted such expense bills or receipts any over or excessive charges paid by such person, firm or corporation. The commission shall impose and collect a reasonable charge for the performance of the service required under this section. All funds received from such charges shall be accounted for by the secretary of the commission and certified monthly by him into the treasury of the state.