Ala. Code § 8-16-13

For the purposes of this article, proof of the existence of weights, measures or weighing or measuring devices in or about any building, enclosure, stand or vehicle in or from which it is shown buying or selling is commonly carried on shall be presumptive proof of their regular use for such purposes and of their ownership by the person so using or possessing them, and such fact shall be deemed to remain established until disproved beyond reasonable doubt.