Md. Code, Bus. Reg. § 10-304.1

(a) Except as provided in subsection (b) of this section, a retail service station dealer may not sell motor fuel below cost. (b) A retail service station dealer may sell motor fuel below cost if the sale is: (1) made in good faith to meet competition; (2) made as part of a final liquidation or closing of the business of the retail service station dealer; (3) made as part of a bona fide charitable promotion lasting no longer than 2 days; or (4) made under the direction or order of a court or government entity. (c) If the Comptroller receives a complaint in writing that a retail service station dealer is selling motor fuel below cost, the Comptroller shall investigate and determine within 3 business days of the receipt of the complaint whether the allegations contained in the complaint are true. (d) The Comptroller shall issue a stop sale notice and may suspend or revoke the certificate of registration of a retail service station dealer if the Comptroller determines that the retail service station dealer is in violation of this section.