Maryland Code, Business Occupations and Professions § 19-309

(1) a certification or, as authorized by the Secretary, other documentation that the licensed security guard agency has paid, for the past 3 years, all withholding and Social Security taxes;

(2) a certification or, as authorized by the Secretary, other documentation that the licensed security guard agency has paid, for the past 3 years, all other obligations payable for the employees of the licensed security guard agency to the State or the federal government;

(3) a certificate from an insurance carrier or, as authorized by the Secretary, other documentation showing that the licensed security guard agency has in effect commercial general and workers' compensation insurance for its covered employees, as defined in § 9-101 of the Labor and Employment Article; and

(4) a certificate from the Comptroller's Office or, as authorized by the Secretary, other documentation showing that the State income tax of the licensed security guard agency has been paid for the past 3 years.