Maybe, when a cop is driving to drop off a criminal, another criminal can pull up beside the cop car and type /rescue (id), the detained criminal will then have 3 seconds to type /escape, once he has done this he will appear on top of the police car, giving him the option to: jump on to the rescuers car and be driven to safety, or; jump off the police car and attempt to run away. Either that or he can simple be transferred to the rescuers car.