The Alderney State Police (ASP) is the police force that patrols the state of Alderney in GTA IV and its DLC. The Alderney State Police is not part of the LCPD nor does it have any connection to it even though it uses LCPD patrol cars.
There are two types of officers: both are fit and are white males. There are no specific Alderney state police officers mentioned or that play a big role in GTA IV. The police of the Alderney state police department resemble those of the New Jersey state police department with their hats and uniforms. The police patches on their arms read Alderney State police in the same patch of the New Jersey state police.
There are a total of three police stations in Alderney, one is a miniature police station located in Acter, Alderney. Unlike the LCPD, the Alderney State Police seem to have more patrols on the highway system known as Plumbers Skyway. This is possibly due to the fact that there is more highway than in Liberty City across the West River. Or it is likely that Rockstar created the police for Alderney to spawn more on the skyway due to them being state police. If the player gets arrested by them, the procedure is the same as if the player had been arrested by the LCPD. The Alderney State Police take your weapons, some money, and release you at the nearest police station.