The police computer is an interactive computer found on board most law enforcement vehicles in Grand Theft Auto IV, two episodes, and Grand Theft Auto: Chinatown Wars that provides access to Vigilante-like side-missions and a small criminal database.
When the player is stationary in any police vehicle they can access the police computer by pressing the L1 button (PlayStation 3), the LB button (Xbox 360), or the E key (PC), allowing the player to search and hunt down most wanted criminals, monitor and respond to recent crimes in the area, search through a small database of criminals in Liberty City, or even call for backup.
Although the police computer is assumed to be standard on all road-based law enforcement vehicles (except bikes), this is not the case in reality, as certain models do not come equipped with it; a significant number of law enforcement vehicles in GTA IV may also lack an actual police computer in their interior despite allowing the player to access one.
The following is a list comparing police computer access on all law enforcement vehicles since GTA IV:
|Vehicle||Introduced in||Police computer model in interior||Access to police computer|
|Police Cruiser||GTA IV||✔||✔|
|Police Patrol||GTA IV||✔||✔|
|Police Stockade||GTA IV||✘||✔|
|NOOSE Cruiser||GTA IV||✘||✔|
|NOOSE Patriot||GTA IV||✘||✔|
|FIB Buffalo||GTA IV||✘||✔|
|Police Cruiser (Buffalo)||TBOGT||✘||✘|
|Police Cruiser (wreck)||TBOGT||✔||✘|
|Police Patrol||GTA Chinatown Wars||n/a||✔|
|NOOSE Enforcer||GTA Chinatown Wars||n/a||✔|
|FIB Rancher||GTA Chinatown Wars||n/a||✔|