The Supreme Court addressed the constitutionality of executing someone who claimed actual innocence in Herrera v. Collins (506 U.S. 390 (1993)). Although the Court left open the possibility that the Constitution bars the execution of someone who conclusively demonstrates that he or she is actually innocent, the Court noted that such cases would be very rare. The Court held that, in the absence of other constitutional violations, new evidence of innocence is no reason for federal courts to order a new trial. The Court also held that an innocent inmate could seek to prevent his execution through the clemency process, which, historically, has been "the 'fail safe' in our justice system."