Ala. Code § 19-3E-11: Chapter Supplemented by Principles of Law and Equity.

Unless otherwise displaced by the provisions of this chapter, the principles of law and equity, including the law merchant and the law relating to principal and agent, estoppel, laches, fraud, misrepresentation, duress, coercion, mistake, insolvency, and other validating or invalidating clauses, supplement its provisions.