For the most part in Maryland the carrying, wearing, or transporting a handgun is prohibited.
§ 4-203. Wearing, carrying, or transporting handgun.
(a) Prohibited.-
(1) Except as provided in subsection (b) of this section, a person may not:
(i) wear, carry, or transport a handgun, whether concealed or open, on or about the person;
(ii) wear, carry, or knowingly transport a handgun, whether concealed or open, in a vehicle traveling on a road or parking lot generally used by the public, highway, waterway, or airway of the State;
(iii) violate item (i) or (ii) of this paragraph while on public school property in the State; or
(iv) violate item (i) or (ii) of this paragraph with the deliberate purpose of injuring or killing another person.
(2) There is a rebuttable presumption that a person who transports a handgun under paragraph (1)(ii) of this subsection transports the handgun knowingly.
But there is an exception for businesses,
(b) Exceptions.- This section does not prohibit:
(7) the wearing, carrying, or transporting of a handgun by a supervisory employee:
(i) in the course of employment;
(ii) within the confines of the business establishment in which the supervisory employee is employed; and
(iii) when so authorized by the owner or manager of the business establishment;
If the owners authorize the supervisory employee to carry one then it appears that they can. I wonder how many know of this provision of the law?