Tennessee Code Title 47. Commercial Instruments and Transactions § 47-18-128

(a) Any person providing goods or services who initiates a preauthorized debit card transaction that is more than twenty-five percent (25%) of the actual transaction amount, or fifty dollars ($50.00), whichever is greater, shall disclose at the time and point of sale that a hold will be placed on the customer's debit card account. The person initiating the hold shall disclose the dollar amount of the hold, if the amount is known. If the hold is initiated at an unmanned remote terminal, service device, or gas pump, the disclosure shall be made in conspicuous type at a location proximate to the point of payment. If the hold initiated is subject to a contractual agreement, order of the purchaser, or other written document, the notice shall be placed in conspicuous type in a segregated box on the front of the document.

(b) A violation of this section constitutes an unfair and deceptive act or practice.