You will have to be on a certain mission to play the cop mod on GTA. GTA is a type of game.
There is no way to do so.
No, but you can get cheat to get a FBI Buffalo and it has the cop computer where you can search people and call for back up.
You could always try Grand Theft Auto .
There is a multiplayer mode called cops n crooks where you are either a cop or a criminal , this is featured on the multiplayer of every system that has gta iv PC , 360 and ps3
you can play the online game mode "cops and crooks" or you can get a player selector mod.
not even a target mode is there
You have to order it and receive it I'm the mail... It isn't on the streaming that you can get for your wii, Xbox or play station...
To get Niko into vigilante mode, you have to jack a cop car and tap into the cop's in-car computer. You will be prompted to do this, and then you can scan the options for the vigilante missions.
You can't get a uniform in GTA IV, but you can hunt down criminals via the police computer in any cop car (including fib buffalo) by pressing: on PC - E, on Xbox 360: LB, On PS3, L1 I think. However, in GTA San Andreas you are able to wear a cop uniform, and even a paramedic suit!
It is probably worth visiting The Grand Theft Wiki site, which has a comprehensive section on Modifications. Hopefully this may answer your query more fully:gta.wikia.com
By jacking a cop car, Niko can access the cop computer (instructions on screen) to find names of criminals to hunt down in vigilante mode, and gain a reward.