This episode's headline: Countering Terrorism; War on Drugs: Cutting the Roots. The guests include In New York: Maj. Gen. SHLOMO GAZIT (Ret.), Ex-Chief, Israeli Intelligence; In East Lansing, Michigan: ROBIN WRIGHT, Journalist; In Montreal: RODNEY WALLIS, International Air Transportation Association; In Washington: JON THOMAS, State Department; Rep.CHARLES RANGEL, Democrat, New York; Chairman, Narcotics Committee; Reports from NewsHour Correspondents: ANDREW TAYLOR (BBC), in London; KATE ADIE (BBC), in Tripoli; COLIN BAKER (Worldwide Television News), in Colombia. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JUDY WOODRUFF, Correspondent