This episode's headline: Starr Vs. Secret Service; Kosovo's Rebels; New Missile Threat; Say Cheese. ANCHOR: JIM LEHRER; GUESTS: STUART KNIGHT,Former Secret Service Director; JONATHAN TURLEY, George Washington University Law School; DONALD RUMSFELD, Chairman, Ballistic Missile Threat Commission; RICHARD GARWIN, Ballistic Missile Threat Commission; CORRESPONDENTS:CHARLES KRAUSE;KWAME HOLMAN;MARGARET WARNER;RICHARD RODRIGUEZ