OnStar's already rolled out a method for slowing down stolen vehicles once the cops have 'em in sight, and it looks like it's now come up with a solution for the ones that get away as well. Dubbed Remote Ignition Block, the new sevice does just what it promises and uses GPS to prevent the vehicle from starting again once the ignition has been turned off. As with most of these systems, however, the police will first have to confirm that the vehicle is in fact stolen before OnStar flips the switch, so you'll have to come up with something else for your next grand workplace prank. No word on specifics just, but OnStar says it'll be making the service available on over two million GM 2009 and 2010 model year vehicles.