Security police officers are employed by or for a governmental agency or corporations to provide security services to those properties. Security police protect facilities, properties, personnel, users, visitors and enforce certain laws and administrative regulations. Most security police have limited arrest authority. The law enforcement powers of security police vary by federal, state and city law. Different from general Police departments, the primary focus of security police is on the protection of specific properties or facilities. This causes some overlap with functions normally performed by security guards. In some countries, security police is the name given to the secret security and intelligence services charged with protecting the state at the highest level, including responsibilities such as personal protection of the head of state, counter-espionage, and anti-terrorism. Types of special police and similar organizations Examples of Special police may include: United States Campus special / security police, who are often hired and sworn in as state law enforcement officers. Housing special / security police, who protect publicly owned housing or "housing facilities" Hospital / Medical center special / security police such as the Texas Medical Center Police Park special / security police, who primarily protect parks facilities. Capitol special / security police, who protect state properties such as legislative and executive buildings, which can also include executive protection functions Special police (also auxiliary police), in the protection of public properties, such as the United States Holocaust Memorial Museum which is protected by sworn special police officers as authorized by D.C. Code, § 4-114 (1981) Court special / security officer who provide police and security services at court houses Company police to provide security police services on company or private property by contract, where local law permits private organizations to contract for police powers; this for example includes railway police. U.S. Federal Reserve Police, the law enforcement unit of the Federal Reserve System, the central banking system of the United States Legal authority of special / security police officers All special / security police officers derive their authority from the listed sources: The laws of their nation, territory or municipality federal / state / city The property rights of their employing or contracting agency or activity, which may be public or private or a mixture of both These powers may include limited power to detain, arrest, investigate criminal offenses, carry weapons. Some special / security police have peace officers with the same