“LET’S BE CAREFUL OUT THERE.” So ends each roll call session at the Hill Street station house. As the cops and detectives head out to the streets, Captain Frank Furillo begins the delicate balancing act of providing enough protection for the law-abiding citizens without inciting the neighborhood gangs and local criminal elements who are openly hostile towards any police presence. Yet as dangerous as his inner city precinct can be, Furillo's biggest battles often involve protecting his own cops from the Public Defender's office, self-serving bureaucrats, and even each other.