Maryland Criminal Procedure Section 2-101

      (a)      In this title the following words have the meanings indicated.

      (b)      "Emergency" means a sudden or unexpected happening or an unforeseen combination of circumstances that calls for immediate action to protect the health, safety, welfare, or property of a person from actual or threatened harm or from an unlawful act.

      (c)      "Police officer" means a person who in an official capacity is authorized by law to make arrests and is:

            (1)      a member of the Department of State Police;

            (2)      a member of the Police Department of Baltimore City;

            (3)      a member of the Baltimore City School Police Force;

            (4)      a member of the police department, bureau, or force of a county;

            (5)      a member of the police department, bureau, or force of a municipal corporation;

            (6)      a member of the Maryland Transit Administration Police Force or Maryland Transportation Authority Police Force;

            (7)      a member of the University of Maryland Police Force or Morgan State University Police Force;

            (8)      a special police officer who is appointed to enforce the law and maintain order on or protect property of the State or any of its units;

            (9)      a member of the Department of General Services security force;

            (10)      the sheriff of a county whose usual duties include the making of arrests;

            (11)      a regularly employed deputy sheriff of a county who is compensated by the county and whose usual duties include the making of arrests;

            (12)      a member of the Natural Resources Police Force of the Department of Natural Resources;

            (13)      an authorized employee of the Field Enforcement Bureau of the Comptroller's Office;

            (14)      a member of the Maryland-National Capital Park and Planning Commission Park Police;

            (15)      a member of the Housing Authority of Baltimore City Police Force;

            (16)      a member of the Crofton Police Department;

            (17)      a member of the WMATA Metro Transit Police, subject to the jurisdictional limitations under Article XVI, § 76 of the Washington Metropolitan Area Transit Authority Compact, which is codified at § 10-204 of the Transportation Article;

            (18)      a member of the Internal Investigative Unit of the Department;

            (19)      a member of the State Forest and Park Service Police Force of the Department of Natural Resources;

            (20)      a member of the Department of Labor, Licensing, and Regulation Police Force;

            (21)      a member of the Washington Suburban Sanitary Commission Police Force; or

            (22)      a member of the Ocean Pines Police Department.