In the field of surveillance and control of the crossing of the state border, the Border Police, among many other specific activities:  ensures public order at the state border crossing points;  performs border control and authorizes the crossing of the state border of the Republic of Moldova of persons;  does not allow the entry into and departure from the Republic of Moldova of persons who, according to the legislation, are prohibited from entering the Republic of Moldova, who do not meet the conditions for entry into the Republic of Moldova or who are temporarily restricted in the right to leave the Republic of Moldova. In the field of combating irregular migration and cross-border crime, the Border Police, among many other specific activities:  carries out, within the limits of its competences, actions to prevent, detect and counteract irregular migration and other cross-border offenses related to the irregular movement of persons;  notes, on the state border, the contraventions related to the irregular residence of foreigners and the irregular crossing of the state border by persons;  performs special investigation measures;  pursues criminal prosecution;  applies the measure of non-entry of foreigners into the Republic of Moldova;  ensures control over migration at state border crossing points. In carrying out its duties, the Border Police, among many others, has the following obligations:  not to allow the crossing of the state border through the crossing points to persons who do not have valid documents or who have violated the legislation governing entry, departure, transit and stay on the territory of the Republic of Moldova.;  to detain, at the request of the competent authorities, the wanted persons in case they escape prosecution or criminal punishment, as well as to detain persons in other cases provided by law. To ensure that the tasks of preventing and combating cross-border crime, including trafficking in human beings, organizing irregular migration, crossing the state border, smuggling, forging and fraudulent use of documents, the Border Police, within the established limits of legislation:  pursues criminal prosecution;  notes and examines the contraventions;  undertakes legal expertise;  performs special investigation measures. The Border Police exercises its duties within the border area and state border crossing points, and in the case of combating irregular migration and cross-border crime - and outside this area. 8