Md. Code, Public Safety § 10–110

(a) Unless the person holds a permit issued under this subtitle, a person may not:

(1) discharge fireworks; or

(2) possess fireworks:

(i) with intent to discharge or allow the discharge of the fireworks in violation of this subtitle; or

(ii) for the purpose of disposing or selling the fireworks to a person for use or discharge without a permit, if a permit is required by this subtitle.

(b) (1) Except as otherwise provided in this subtitle, a person may not sell fireworks to another person without a permit issued under this subtitle.

(2) (i) A person licensed by the State Fire Marshal under Subtitle 2 of this title may sell or deliver fireworks to a bona fide distributor, jobber, or wholesaler with a principal place of business in a state where the sale or possession of fireworks is allowed.

(ii) The State Fire Marshal may require a person who is an out-of-state distributor, jobber, or wholesaler to submit a certificate issued by the person’s state of operation that demonstrates authority to buy and receive fireworks.