Unmarked police vehicles are not going to be in the game. That's a good thing in terms of traffic because having unmarked patrol officers in traffic checking for speeders might just be too much. On the other hand, certain detectives (not csi) might want to use them to not draw attention while following criminals to drugdeals , stand lookout, watch someones house and so on. The issue is not the wishes of some people but the workarounds. An off-duty officer could just do these things in his civillian clothes and car and phone his superior when backup and police powers are needed. Hell, an officer could even employ trusted civillians to to this. Would it not be better to give the police the option and supply unmarked vehicles to certain supervisers. The idea behind not putting these in the game was make make clear who is police and who isn't but aren't unmarked vehicles and officers wearing nothing but a badge and holster apart from a suit or shirt (and pants =P) more recognisable than civillian cars and clothes. It'd be a shame if the police had to outscource this to PI's.