Prisoners attempting to challenge their convictions have been dealt a major setback by the Supreme Court. In a 5-4 decision, the Court ruled Thursday that criminals do not have a constitutional right to DNA testing after their conviction. In the majority opinion, Chief Justice John Roberts said it is up to the states and Congress to decide who has a right to testing that might prove innocence long after conviction. In the dissenting opinion, John Paul Stevens wrote, “There is no reason to deny access to the evidence and there are many reasons to provide it, not least of which is a fundamental concern in ensuring that justice has been done.” The Innocence Project says DNA testing has exonerated 240 people nationwide, at least seventeen of whom had been sentenced to die.