Maryland Code, Commercial Law § 11-506

(a) In any proceeding under this subtitle, including a proceeding relating to licenses before the Executive Director, proof of a sale by a retailer or a wholesaler of cigarettes or of any other item in combination or in connection with cigarettes at less than their cost to the retailer or their cost to the wholesaler, respectively, is prima facie evidence of intent to injure a competitor or to destroy or substantially lessen competition.

(b) In determining cost to the retailer or cost to the wholesaler, the Executive Director or the court shall receive and consider evidence: