Md. Code, Environment § 9–809

(a) (1) Any bond issued under this subtitle that bears the signatures of the officers in office on the date the bond is signed is a valid and binding obligation notwithstanding that:

(i) At the time of delivery of or payment for the bond, any or all of the signers are no longer officers of the municipality; or

(ii) Any proceeding that relates to the development of the sewerage facility for which the bond is issued is invalid or irregular.

(2) A signature may be by facsimile as provided in § 2-303 of the State Finance and Procurement Article.

(b) A recital in the bond that the bond is issued under this subtitle is conclusive evidence of:

(1) The validity of the bond; and

(2) The regularity of the issuance of the bond.