In order to get Immunity without completing the game just go to undercover, get to a mission called "steal a cop car" locate the police station, Enter take a ride in Rio.
Get to the police station. Get out and stand facing in front of the garage door. Turn around. You should be facing a big building.
There is a series of doors on the building. Go in front of the one farthest to the left and click
triangle. It will say "you have unlocked a cheat.
Exit and go to options,then gameplay, then secrets and turn on immunity.
I have beaten Driver2 and about to beat Driver.
Added by: Smiley , ID#1971