Law enforcement in Finland is the responsibility of several agencies. The Police of Finland, a national police agency, is responsible for most tasks. The two other main agencies are the Finnish Border Guard and the Finnish Customs. Other agencies with limited police powers are the Finnish Defence Forces, municipal parking inspectors, and some railway staff.
The Police of Finland is subordinate to the Ministry of the Interior and divided into the National Police Board, two national units and 11 local police departments. Within the departments, there is a division between uniformed patrol police (järjestyspoliisi, "order police") and criminal investigation (rikospoliisi, "criminal police"). The function of each police department is to maintain general law and order, prevent crime, investigate crime and other events that threaten public order and safety, to carry out traffic control and surveillance and promote traffic safety.
The national unit is the Police University College, which is responsible for police training, research and development.
The Finnish Security Intelligence Service (Suojelupoliisi, Supo) specializes in "the prevention of security threats of the State," such as counterintelligence and terrorism. Supo was a police agency but was moved directly under the Ministry of the Interior in 2016.
The NBI is a nation-wide law enforcement agency. It is tasked with fighting international, organised and serious crime. And also counterintelligence and terrorism to some extent. Karhu ryhmä is also under the control of the NBI.
The Finnish Border Guard have police powers in border zones; likewise, Finnish Customs have police powers when dealing with arriving persons and goods. Within their fields of work, the Customs and Border Guard officers have most police powers. In the Customs, the power to arrest is delegated to the level of senior customs inspectors. In the Border Guard, the power to arrest is delegated to the level of border control detachments commander. The Border Guard is also responsible for search and rescue and maritime search and rescue. The Customs may utilize all investigative police powers, with the exception of the use of deep-cover personnel and sting operations. The Border Guard may use almost all investigative powers. The Customs also occasionally enforces laws such as fuel taxes and vehicle traffic-worthiness, without connection to imported goods.