Maryland Code, Alcoholic Beverages § 29-504

The provisions of Section 13A-11-73 shall not apply to marshals, sheriffs, prison and jail wardens and their regularly employed deputies, policemen and other law enforcement officers of any state or political subdivision thereof, or to the members of the Army, Navy, or Marine Corps of the United States or of the National Guard, or to the members of the National Guard organized reserves or state guard organizations when on duty or going to or from duty, or to the regularly enrolled members of any organization duly authorized to purchase or receive such weapons from the United States or from this state;  provided, that such members are at or are going to or from their places of assembly or target practices, or to officers or employees of the United States duly authorized to carry a pistol, or to any person engaged in manufacturing, repairing, or dealing in pistols, or the agent or representative of such person possessing, using, or carrying a pistol in the usual or ordinary course of such business, or to any common carrier, except taxicabs, licensed as a common carrier, or to any person permitted by law to possess a pistol while carrying it unloaded in a secure wrapper, from the place of purchase to his home or place of business, or to or from a place of repair or in moving from one place of abode or business to another.