A Jefferson County grand jury declined yesterday to indict two detectives in the fatal Dec. 5 shooting of an African-American man holding a box-cutter knife with his hands cuffed behind his back. ''Every person in Kentucky, whether a citizen or police officer, has the right of self-defense,'' Commonwealth's Attorney Dave Stengel said at a news conference last night, after the grand jury's decision in the slaying of James Edward Taylor was announced. ''On that night, Mr. Taylor used a box-cutter as deadly physical force,'' Stengel said, forcing Detective Michael O'Neil to defend himself. Stengel said that when asked by the...