In this title the following words have the meanings indicated. “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. “Police officer” means a person who in an official capacity is authorized by law to make arrests and is: a member of the Department of State Police; a member of the Police Department of Baltimore City; a member of the Baltimore City School Police Force; a member of the police department, bureau, or force of a county; a member of the police department, bureau, or force of a municipal corporation; a member of the Maryland Transit Administration Police Force or Maryland Transportation Authority Police Force; a member of the University System of Maryland Police Force or Morgan State University Police Force; 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; a member of the Maryland Capitol Police of the Department of General Services; the sheriff of a county whose usual duties include the making of arrests; a regularly employed deputy sheriff of a county who is compensated by the county and whose usual duties include the making of arrests; a member of the Natural Resources Police Force of the Department of Natural Resources; an authorized employee of the Field Enforcement Bureau of the Comptroller’s Office; an authorized member of the Field Enforcement Division of the Alcohol and Tobacco Commission; a member of the Maryland–National Capital Park and Planning Commission Park Police; a member of the Housing Authority of Baltimore City Police Force; a member of the Crofton Police Department; 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; a member of the Intelligence and Investigative Division of the Department; a member of the State Forest and Park Service Police Force of the Department of Natural Resources; a member of the Washington Suburban Sanitary Commission Police Force; a member of the Ocean Pines Police Department; a member of the police force of the Baltimore City Community College; a member of the police force of the Hagerstown Community College; an employee of the Warrant Apprehension Unit of the Intelligence and Investigative Division in the Department; a member of the police force of the Anne Arundel Community College; or a member of the police department of the Johns Hopkins University established in accordance with Title 24, Subtitle 12 of the Education Article.