Pierce Butler, Hammer v. United States — Opinion of the Court
“ It is whether, as against the petitioner, his testimony at the trial is enough to sustain a finding that his oath before the referee was false. Clearly the case is not as strong for the prosecution as where a witness, presumed to be honest and by the government vouched for as worthy of belief, is called to testify to the falsity of the oath of defendant set forth as perjury in the indictment. Here the sole reliance of the government is the unsupported testimony of one for whose character it cannot vouch-a dishonest man guilty of perjury on one occasion or the other. ”
