Maryland Code, Public Safety § 11-110

(a) The owner or operator of a mine, quarry, or other operation or business that uses explosives, or a contractor who performs work that uses explosives, required to obtain a license to engage in business as a dealer under this subtitle:

(b) Regardless of whether the owner, operator, or contractor has obtained a license to engage in business as a dealer, an employee of the owner, operator, or contractor need not obtain a license to possess explosives other than explosives for use in firearms in order to possess explosives issued or sold to the employee by the owner, operator, or contractor.