This project just recently launched on Kickstarter. It's a bit like a police equivalent to Flash Point: Fire Rescue in that it's a cooperative game where you're struggling to accomplish multiple objectives. It's a bit different in that one player is secretly a corrupt cop, so you are also trying to figure out who that is.
http://www.kickstarter.com/projects/1529038443/police-precinctOf course, corrupt cop doesn't work well in a two-player game, but it would with three or more. I didn't see anything explaining the max number of players, but it looks like the game can easily scale.