Ala. Code § 40-17A-14
For the purpose of determining the correctness of any return, determining the amount of tax that should have been paid, determining whether or not the dealer should have made a return or paid taxes, or collecting any taxes under this act, the commissioner may examine, or cause to be examined, any books, papers, records, or memoranda, that may be relevant to making such determinations, whether the books, papers, records, or memoranda, are the property of or in the possession of the dealer or another person. The commissioner may require the attendance of any person having knowledge or information that may be relevant, compel the production of books, papers, records, or memoranda by persons required to attend, take testimony on matters material to the determination, and administer oaths or affirmations. The commissioner may issue subpoenas which may be served by authorized agents of the Department of Revenue to compel the attendance of witnesses or the production of documents, books, papers, records, bank records, and any other writing or memoranda.
Ala. Code § 40-17A-14 (1975)