This is no minor inconvenience , as security checkpoints ( manned by ` pols ' and ` Nats ' , the police and National Guard ) are set up throughout the city to stop and arrest anyone without valid ID . This is no minor inconvenience , as security checkpoints ( manned by `` pols '' and `` nats '' , the police and National Guard ) are set up throughout the city to stop and arrest anyone without valid ID .