The effectiveness of the border management system is significantly affected by the rules and processes chosen to enforce the conditions under which entry is permitted. This responsibility in some States is typically split between the management of persons, goods, vessels and vehicles, as well as that of aircraft. However, responsibilities can also overlap. For instance, immigration officials are primarily responsible for the management of entry and stay of persons, but some might also have the authority to check goods and vehicles if there are suspected drugs, weapons, victims of trafficking in persons, smuggled migrants or migrants in an irregular situation involved.
Agencies responsible for border management usually deploy officials at or in the vicinity of borders. While all these borders – land, air and water – are monitored and controlled, not all border control/crossing points have a dedicated border security staff and facilities present. In general, when border security staff are present, and there are facilities to check passports and visas, then it typically becomes a place where one may lawfully enter a country, also defined as a point of entry (POE). There are typically three types of POE: airports, land border crossings (rail, road) and blue border crossing (sea, river, lakeports).