Maryland Code, Insurance § 1-208

(1) a written statement signed by the individual making it in which the individual solemnly affirms under the penalties of perjury that the contents of the document are true to the best of the individual's knowledge, information, and belief; or

(2) a certification of an officer authorized to administer an oath that a named individual made oath that the contents of the document are true to the best of the individual's knowledge, information, and belief.