(AP) -- The FBI's file on former Chief Justice William Rehnquist — made public more than a year after his death — indicates the Nixon and Reagan administrations enlisted its help in blunting criticism of him during confirmation hearings. The file also offers insight into the hallucinations and other symptoms of withdrawal that Rehnquist suffered when he was taken off a prescription painkiller in 1981. A doctor was cited as saying that Rehnquist, an associate justice of the Supreme Court at the time, tried to escape the hospital in his pajamas and imagined that the CIA was plotting against him....